燕王拜孟赢作为他的宰相

correction:孟赢让燕王任命他（苏秦）为宰相

Note:我历史不好，所以只是按字面意思翻成了现代文，哈哈。
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In that period, the king and the minister are almost equal in status.<o:p></o:p>

Let's say, a chairman need to ask politely and make a courtesy call to appoint the CEO.<o:p></o:p>

Well, after Han dynasty, this procedure is no more as the emperor became absolute.<o:p></o:p>

"拜"是中國古代君王對尊敬的人一個儀式，也可用在"拜師學藝"。

A ritual to show respect. 

孟嬴是燕易王的妻子。

孟赢令燕王拜其为相 = 孟赢让燕王任命他（苏秦）为宰相