它并不是由于某种原因而在过去几百年里减少的庞大人口的残余。
It's not a remnant of some huge population that is dwindled in the last few hundred years for some reason.
“在过去的几百年里，我们唱着这首歌为外国人做事，”他说，“我们把自己的痛苦藏在石头底下，然后唱着歌前进。
“We sung this over the many centuries we were working for foreign powers,” he says. “We would leave our problems under a stone, and go and sing.
在过去的几百年里，不管是有意地还是无意地引进新物种，都暴露出一些问题。
Introductions of new species, both accidental and deliberate, over the past few centuries show the problem.
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