Why? Is it only because tropic zone has a higher temperature?

为什么会出现这种情况？仅仅是因为热带比寒带更热？

This indicates that these climatic events exerted influence on sea area around tropic zone.

这表明快速的气候变化事件也会影响到热带海区。

There are about 190 species of Diospyros in the world. They mainly distribute in the tropic and subtropic zone, especially in East Asia.

全世界的柿属植物共约190种，主要分布在热带和亚热带，尤其是东亚。

The proportion of alien invasive species originating from the tropic zone was close to that from temperate regions. The proportion of alien invasive plants caused by intentional introduction was 39%.

外来入侵物种中热带来源与温带来源比例相当，人为引入导致的外来入侵植物高达39%。

Bozhou lies in south of the North temperate Zone, it is mainly affected by tropic oceanic air mass and polar continental air mass, with a climate of seasonal temperate semi-humid monsoon.

亳州市地处北温带南部，属暖温带半湿润季风气候，为热带海洋气团和极地大陆气团交替控制接触地带。

The germplasms of cold tolerance were not only widely existed on tropic, subtropic and temperature zone, but also difference with cold tolerance among plants of one landrace.

苗期耐冷种质广泛存在于热带、亚热带和温带地区，品种间苗期耐冷差异也明显。

The families of these mammals were divided into 10 categories, in which the old-continent-tropic-subtropic and temperate zone is the largest type with 9 families.

其科级分类阶元的分布型为10类。 其中，以旧大陆热带、亚热带和温带分布型为主，次类型者有9科；