如果经常如些
If more often
以上为机器翻译结果，长、整句建议使用 人工翻译 。
如果你不利用，你将会失去它。演化经常带走一些功能而不是给予。穴居的鱼儿失去了眼睛，而寄生虫类如绦虫则没有了内脏。
If you don't use it, you tend to lose it. Evolution often takes away rather than adding. For instance, cave fish lose their eyes, while parasites like tapeworms lose their guts.
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