Pollen Pollinated Amount Potential Subject Hazards Grains Long

意群训练： Becaus e the potential hazard s pollen grain s are subject t o as they are transporte d over long distance s are enormous ，wind pollinated plant s have, in the view above ，compensated fo r the ensuin g loss of pollen through happenstance by virtue o f producing an amount of polle n that is one to three orders of magnitud e greater tha n the amount produce d by species pollinated by insects .

标志：Because the potential hazards that pollen grains are subject to /as they are transported over long distances/) are enormous ，wind pollinated plants have , in the view above ，compensated for the ensuing loss of pollen (through happenstance) /by virtue ［of producing an amount of pollen (that is one to three orders of magnitude greater than the amount produced by species pollinated by insects)］.

译文： 由于（花粉颗粒/在远距离传播时/所受到的）潜在危险 是巨大的 ，因此，在以上观点中 ，风媒植物 补偿了随之而来的（由于偶然性所带来的）花粉浪费 ，通过［产生的花粉数量（比由虫媒植物所产生的花粉的数量高一到三个数量级 的）］本领 。

解释： 本句就是上面所说的构成本篇文章首段的第二句话，而且本句的难度超过上一句。本句一上来就不好读：Because the potential hazards (that pollen grains are subject to /as they are transported over long distances/) are enormous ，其中主语后的pollen grains are subject to本来是一个定语从句，但是由于主语the potential hazards 在从句中作介词to的宾语，所以引导词that被省略，这就显得句子的结构模糊不清，再加上as引导的状语从句，隔开了主语和谓语，给读者造成了较大的阅读困难。后面的分句中，句子的结构更为复杂：插入语、定语和状语层层相套。

有两个词组需要解释一下：orders of magnitude 指的是数量级，其中order是等级、级别的意思，而magnitude在此不是指重要、星球的光亮度，指的是尺寸大小或数量多少的程度，同义词是size，quantity，number。后面的species pollinated by insects特指虫媒植物。