生态学家警告说，外表可能具有欺骗性，而且这些外来物种中可能有许多是为人接受的，只是因为没有人记载过其有害影响。

Appearances can deceive, ecologists caution, and many of these exotics may be considered acceptable only because no one has documented their harmful effects.

youdao

来自于柏拉图公元前360年的对话是史上所知的唯一关于这个标志性城市的记载。

Plato's 'dialogues' from around 360 B. C. are the only known historical sources of information about the iconic city.

youdao

来自于柏拉图公元前360年的对话是史上所知的唯一关于这个标志性城市的记载。

Plato's 'dialogues' from around 360 B.C. are the only known historical sources of information about the iconic city.

youdao