But the drugs cannot reverse brain damage that has already occurred, and they carry risks of their own because they also strip useful metals from the body, such as iron and zinc.
而这种药物无法弥补已产生的大脑损伤，且药物本身存在风险，因为它们也会将有用的金属元素，如铁与锌一并剥离排出体外。
With a capacity of 400,000 tonnes and measuring 362m in length and 65m in width, this goliath can carry twice as much iron ore as most vessels now plying the route between Brazil and China.
这艘巨轮长362米，宽65米，载重量40万吨，可以比目前定期往返于巴西和中国之间的大多数轮船多装一倍的铁矿石。
Put simply, the blood becomes more watery and can't carry as much oxygen - iron deficiency anaemia.
简而言之，血液越来越稀薄，不能携带足够的氧气--这就是缺铁性贫血。
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