| en | It is one of nature's great ironies that the availability of nitrogen in the soil frequently sets an upper limit on plant growth even though the plants' leaves are bathed in a sea of nitrogen gas. |
|---|---|
| category | gre |
| idx | 045 |
| parts | 意群训练： It is one of nature' s great ironies tha t the availability of nitrogen in the soi l frequently set s an upper limi t on plant growth even though the plants' leaves are bathed i n a sea of nitrogen gas . |
| mark | 标志： It is one of nature's great ironies that the availability of nitrogen (in the soil) frequently sets an upper limit / on plant growth/ even though the plants' leaves are bathed /in a sea of nitrogen gas/. |
| cn | 译文： 这真是自然界的一个巨大的讽刺：（土壤中的氮的供给之少 ） 经常/给植物的生长/设立 一个上限 ，尽管 植物的叶子 被沉浸于 /氮气的海洋中/。 |
| explain | 解释： It是形式主语，其真正的内容是that之后的由even though连接的两个句子。其实本句的真正难度倒不在于句子的结构，而是对于其意思的理解。尤其是文科学生，可能缺乏必要的背景知识，就更不容易读懂。句中的set an upper limit on plant growth直译为“给植物的生长设立一个上限”，其真正的意思是“限制了植物的生长”；因此the availability of nitrogen in the soil frequently sets an upper limit on plant growth之中的availability一定指的是氮的供给之少。整句话的意思是，土壤中的氮植物能够利用，却太少；而空气中虽有大量的氮，植物却不能利用，这岂不是自然界所开的一个大玩笑？ |
| type | 复杂修饰 |
| score | 3 |
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