Low iron levels in the blood can cause severe fatigue.

血液中铁含量低会导致严重的疲劳。

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These areas have particularly low concentrations of iron, and oceanographers hypothesize that this shortage of iron prevents plankton from thriving.

这些地区的铁含量特别低，海洋学家推测，铁的缺乏阻碍了浮游生物的繁殖。

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And low iron levels in blood can cause severe fatigue. To get a good dose of iron, try bison.

而血液中含铁量过低容易引起严重的疲劳感，为了摄取适量的铁，试一下野牛。

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On the fifth hole Thursday, for example, Woods's low-boring iron off the tee found the left side of the fairway.

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The likelihood of Iron Man 3 coming close to matching the super team-up movie are low, since that would require the third Iron Man film making as much money domestically as Iron Man 2 took in worldwide.

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