如同买进一样，投资者也需要卖出的纪律性。

As with buying, investors need a discipline for selling.

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不过据交易员们说，为了尽量降低赔钱的风险，他们反过来需要卖出。

But to minimize the risk of losing money, they in turn needed to sell, according to traders.

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欧洲公司承认其需要卖出420架以上的飞机才能够达到收支平衡。

The European firm admits that it needs to sell more than 420 planes just to break even.

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