The stand-ins are already in use on Line 6.
这些替代品已经在6号线上投入使用了。
But somewhere along the line, primates discovered how to stand up and walk on two legs.
但在进化线上的某处，灵长类动物发现如何用两条腿站起来走路。
The third was manned by a single nervous Talib who ordered us out of the car and made us stand in line by the road while he tried to call his commanders on a mobile phone.
第三个检查站上只有一个神经紧张的塔利班战士，他命令我们从车里出来，让我们沿路站成一排，同时用移动电话联系他的指挥官。
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