In this article, the contrastive teaching way in terms of cultural background, phon etic system, pronunciation and intonation is discussed.

介绍了通过英美文化背景、标音体系、发音、语调等多方面的对比进行英语语音教学的方法要领。

Bacteria such as Citrobacter sp. harboring phoN, a gene encoding a nonspecific acid phosphatase, have been reported to precipitate heavy metals efficiently.

含编码非特异性酸性磷酸酶基因（phoN）的细菌如柠檬酸杆菌（Citrobacter freudii）等能有效地吸附去除废水中的重金属，但这类微生物对辐射敏感。

Increasing the thick-ness of porous layer suitably was of benefit to boiling heat transfer. The coefficient of boiling heat transfer decreased as the height of thermal si-phon...

适当增大多孔层厚度将有利于沸腾传热系数的提高，而热虹吸高度的降低将不利于沸腾传热系数的增大。