供给线路的麻烦也是危险关系的另一种信号，但美国及其盟友必须保持在阿富汗的持续战斗。
The supply-route troubles are yet another sign of the precarious relationships that the United States and its allies must maintain to continue the fight in Afghanistan.
“腿的长度和心脏病之间有一个直接成比例的危险关系，”乔治·大卫·史密斯说。
"There's a directly proportional risk between leg length and heart disease," says George Davey Smith, m.d..
“腿的长度和心脏病之间有一个直接成比例的危险关系，”乔治·大卫·史密斯说。
"There's a directly proportional risk between leg length and heart disease," says George Davey Smith, m.d..
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