The US Fish and Wildlife Service said that nearly a billion monarchs have disappeared from overwintering sites since 1990.

美国鱼类和野生动物管理局表示，自1990年来，近十亿只帝王蝶在越冬地点消失了。

Helophyte a perennial marsh plant that has its overwintering buds under water.

的沼泽植物，具有水下越冬芽。

Helophyte a perennial marsh plant that has its overwintering buds under water.

沼生植物：多年生的沼泽植物，具有水下越冬芽。

Correlation analysis between rate of overwintering and yield componenet were made.

通径分析结果表明，对产量的直接影响力穗数最大，越冬率最小。

The main function of the downiness of Hippophae mainly is to protect the buds overwintering.

沙棘表皮毛的主要功能是保护冬芽越冬。

There is a significant correlation between dry leaves yield and overwintering survival rate.

宿根干叶产量与越冬率呈极显著正相关。

Helophyte a perennial marsh plant that has its overwintering buds under water. An example is bulrush (Typha).

沼生植物：多年生的沼泽植物，具有水下越冬芽。例如芦苇(香蒲)。

The strong overwintering branches were good cutting materials and early summer was optimum season for raising...

健壮之越冬枝条是三角梅理想的扦插材料，初夏扦插育苗效果较好。

The result showing that the overwintering death of black currant is related to the variety's own characteristics.

结果表明，黑穗醋栗越冬死亡和其品种自身特性有关。

The changes of water state, starch and soluble sugar contents were highly related to the overwintering ability of plant.

水分含量及可溶性糖，淀粉季节性动态变化与植物的抗寒性发育及越冬适应性具有高度一致性。

In this condition the overwintering larva survived with very high percentage and became the first source in coming year.

在这种情况下越冬幼虫存活率高，成为下一年的虫源。

The number of total stems of winter wheat reached the highest before overwintering stage and declined after overwintering.

冬小麦的总茎数各品种均在越冬前达最大值，越冬后呈下降趋势。

The distribution patterns of diseased plants seriousness in overwintering period and flowering stage were of aggregation distribution.

病级分布在越冬期和盛花期均为聚集分布。

Hydrocarbons were the major lipid class extracted by hexane or chloroform from the cuticular surface of overwintering gall fly larvae.

碳氢化合物主要油脂类提取正己烷氯仿或从表面角质层越冬虫瘿苍蝇幼虫。

Many overwintering organisms produce antifreeze proteins that can be adsorbed onto the surface of ice crystals and modify their growth.

很多越冬的生物会产生抗冻蛋白，这些抗冻蛋白能够吸附到冰晶的表面改变冰晶形态并抑制冰晶的生长。

The invention discloses a thermal insulation flowerpot which aims at providing a flowerpot convenient for flowers and plants overwintering.

本发明公开了保温花盆，目的在于提供便于花草越冬的花盆。

Consequently, the low winter temperature is the key factor confining the distribution and overwintering population base of this insect pest.

冬季低温是限制柑桔潜叶蛾分布和决定越冬虫口基数的关键因子。

The nutrient composition in the whole body of Rana catesbiana at different growth and developmental stages after overwintering was analysed.

对越冬后牛蛙各生育阶段的整体营养成份进行了分析。

Many overwintering organisms produce antifreeze proteins (AFPs) that can be adsorbed onto the surface of ice crystals and modify their growth.

很多越冬的生物会产生抗冻蛋白，这些抗冻蛋白能够吸附到冰晶的表面改变冰晶形态并抑制冰晶的生长。

In this paper the regularity of free water in shoot of young apple trees with different treatments was determined during the overwintering period.

研究了苹果幼树越冬期间不同处理枝条自由水含量的变化规律。

The result of the study has shown that the method in this paper can forecast accurately the spawning time of corn borer of overwintering generations.

研究结果表明，其方法可以准确地预测越冬代玉米螟的产卵期。

So there is a substance system including "low molecular weight sugars-amino acid-glycoprotein" which enhances cold hardiness for overwintering larvae.

越冬幼虫以“小分子糖—氨基酸—糖蛋白”物质系统形成抗寒基质，增强耐寒性。

In our study on comparison of the alfalfa cultivars from different regions during 1980~1983. the death phenomenon of overwintering plants was observed.

1983年在乌鲁木齐市对新疆及外地几个苜蓿品种比较试验过程中，观察到苜蓿死亡现象。

They must lay their eggs without touching the ice, but it is the males that face the greatest challenge - overwintering alone in the coldest place on earth.

他们必须产卵不接触冰，但它是最大的挑战-越冬独自在地球上最冷的地方的男性。

The simple filter apparatus couldeffectivelly purfty water quality, and raise rearing density and survival rate of the parentshrimp in the overwintering pond.

简易过滤装置可有效地净化亲虾池水质，提高亲虾养殖密度与成活率。

The overwintering stage of Parocneria furva (Leech) in Hengyang, Hunan Province, is reported and its overwintering stages in other areas of China are discussed.

记述了侧柏毒蛾在湖南省衡阳地区的越冬虫态，并对该虫在我国其他地区的越冬虫态进行了探讨。

In 1997 the red claw crayfish (Cherax quadricarinutus)were introduced from Australia and cultured up in the same year for making an experiment on overwintering.

1997年从澳大利亚引进红螫螫虾原种，当年养成并进行井水越冬试验。

The contents of soluble protein and dissociative proline were unabsolutely negatively correlative with the monthly even low temperature during the overwintering.

越冬过程中可溶性蛋白含量和游离脯氨酸的含量和自然温度呈不完全负相关。

In the later stage of overwintering, the descending of glycogen developed slowly, the content of free water increased a little, and the content of fat descended acutely.

越冬后期，糖原含量减少趋势变缓，脂肪含量大幅度下降，自由水含量略有增加。