As we know now, heavy objects and light objects fall at the same speed unless air holds them back.
现在我们都知道,如果没有空气的阻力,重的物体和轻的物体垂直下落的速度是一样的。
( 3 )从属连词 once 意为一旦,强调的是条件。 once 引导的从句可以位于句首,也可以位于句末。例如:
Once the masses have a common aim, they will work with one heart.
一旦群众有了共同的目标,他们就会齐心工作。
Once you show any sign of fear, he will attack you.
你一旦露出任何恐惧的迹象,他就会攻击你。
China will shake the world once it awakens.
中国一旦觉醒,它就会振撼整个世界。
( 4 ) so long as 和 as long as 是复合连词,作只要解,引导条件状语从句,强调主句所述的情况和从句所述的情况同时并存。在表示条件时,前者比后者更常用。例如:
We shall overcome the difficulties so long as we follow the Partys correct policy.
只要我们执行党的正确政策,我们就能克服困难。
Rice will grow well so long as it is given enough sunlight and a good supply of water and fertilizer.
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