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根系占整株植物的一半，但因为它在地下，看不见，而常常被忽略。The root, which may constitute half of the plant, is often overlooked because it is underground and not visible.

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Schistosomiasis, a parasitic disease transmitted by aquatic snails, also seems to be affected by climate.由水生螺传播的一种称为吸血虫病的寄生虫病似乎也会受到气候的影响。

Pollution is caused either by man’s release of completely new and often artificial substances into the environment, or by releasing greatly increased amounts of a natural substance, such as oil from oil tankers into the sea．引起污染有两种途径：一是人们经常把全新的人造物质释放到环境中，或是把大量的天然物质，譬如油轮溢出的石油，释放到海里。

Many of the soldiers are inadequately trained, badly equipped and poorly motivated militiamen.许多士兵是训练不足，装备很差的，而且打仗积极性很低的民兵。

Modern industry needs considerable quantities of this metal, either in the form of iron or in the form of steel.现代工业对这种金属的需求量很大，无论是铁的形式还是钢的形式。