He tested the free-diving self-propelled submersible - one of only two in existence at the time - on increasingly deep dives off the California coast.
VOA: standard.2010.06.21
The pastoral elegy is clearly one of the most stylized and most self-consciously artificial of all of the poetic genres.
田园挽歌明显是所有诗歌类型中,最程式化,最具人工雕琢痕迹的诗种之一。
This process is called self-renewal, so that's one important process of property stem cells, that they're capable of self-renewal.
这种过程称为自我更新,所以这是干细胞的一个重要性质,它们能够自我更新
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