As it happened, Yoel — who sometimes teaches desert survival — never let more than an hour lapse before getting us back into swimming holes.

事实上，有时做沙漠野外生存教练的尤尔总是把走到下一个池塘的时间控制在一小时之内。

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Then, the content of Malonicaldehyde(MDA ), the activity of Superoxide dismutase(SOD) in serum and the survival times of acute hypoxia and swimming were determined.

然后测定各组小鼠血浆中的丙二醛（ MDA）和超氧化物歧化酶（ SOD） 活性及急性缺氧和游泳的存活时间。

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Two main problems have existed for a long time in the elementary swimming teaching in our country. First, swimming as a survival skill has not been popularized among school age people;

我国初学游泳教学一直存在两个问题：游泳作为一项人人必备的生存技能在学龄人群中还不够普及；

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Ritchie Graves, a NOAA Fisheries Service biologist who makes sure federally owned dams are living up to their Endangered Species Act obligations not to kill too many salmon, said the survival rate for young salmon swimming downstream to the ocean has been higher than ever the past three years, hitting about 50 percent for sockeye.

MSN: Record numbers of sockeye salmon return to Northwest - US news - Environment | NBC News