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1·Short selling is selling borrowed stock in the expectation of buying it back later at a lower price, and keeping the difference.

卖空是出售借来股票，期望随后以更低价格购回，从而获取差价。

2·It is more questionable when a trader sells a stock short without even taking the trouble to borrow it or make sure it can be borrowed.

但当一个交易商在还没有确认是否用能力借到股票的情况下就出售还未到手的股票时，问题就产生了。

3·They have borrowed money and put it into stock market.

他们大举借贷，并将之投入股市。