就连乐于开怀大笑的马克吐温也说，当谈到人像照片时，“没有什么比一个又傻又蠢的微笑被永远定格更可怕的了”。
Even Mark Twain, a man who enjoyed a hearty laugh, said that when it came to photographic portraits there could be "nothing more damning than a silly, foolish smile fixed forever".
显而易见的是，「氮循环」比「碳循环」更可怕，变迁得更快，影响也更广泛，不过大家比较关心的却还是「碳循环」。
What seems certain is that the nitrogen cycle is changing faster and more profoundly than the carbon cycle, which has attracted much more attention.
更可怕的是，旅行者装水和干粮的背包也被风暴卷走了。
The worse thing is that his backpack with drinking water and food was also swept far away.
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