Across the American continents, exotic species are those introduced after the first European contact.
在美洲大陆上，外来物种是在第一次接触欧洲后引进的。
According to the facts that we know, (1) D. simulans is an exotic species;
根据了解到的事实，（1）拟果蝇在中国是一个外来种；
Some exotic tree species died and its crown was withered.
一些外来树种发生了树冠干枯和植株枯死。
Some exotic tree species died and its crown was withered.
一些外来树种发生了树冠干枯和植株枯死。
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