they float up
它们漂浮起来
以上为机器翻译结果，长、整句建议使用 人工翻译 。
He was one of the first to say, in the 1930s, that economies could just get stuck: they might sink, and then NOT float magically back up.
BBC: Masters of money: John Maynard Keynes
While rats can swim or float for up to four days, they may get trapped without air in small pipes and crannies as they seek higher ground, Leirs told LiveScience.
FORBES: UPDATED: Rat Invasion? Will Subway Rodents Move Into Flooded NYC Neighborhoods?
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