按照我们的分类标准，仅是本世纪的头十年，我们就发现了大约300种哺乳动物新物种——大部分是啮齿类，也有有袋类，突吻鲸类以及大量的灵长类动物。

Even within our own class, mammals, roughly 300 new species have been discovered in the first decade of this century-mostly rodents, but also marsupials, a beaked whale and a slew of primates.

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汽缸头附有许多突片以增加强度。

The cylinder head is heavily finned for strength.

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上颌骨额突由梨状孔和泪嵴向头侧方向伸出，与额骨和鼻骨相接。

The maxillary processes extend in a cephalad direction form the piriform aperture to the lacrimal crest, uniting with the frontal and nasal bones.

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