国内油画在实践上的问题症结在于忽视了油画这种艺术形式的外来性，而这种外来性无疑正是它的特点所在。

The problem of the practice of this imported medium in China is the overlooking of the foreignness of this form of art that undoubtedly constitutes its very characteristic.

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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.

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珊瑚海是澳大利亚东北海岸独特的生物多样性天堂，有未开发的珊瑚礁、稀有的鲨鱼和大量的外来鱼类。

Home to virgin reefs, rare sharks and vast numbers of exotic fish, the Coral Sea is a unique haven of biodiversity off the northeastern coast of Australia.

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