HELP The forms shorter and shortest are not usually used in these meanings.shorter 和 shortest 通常不用于下列词义。if you go short of or run short of sth, you do not have enough of it缺乏；短缺◆We're running short of stock so we'd better put in an order.库存不多了，因此我们最好订一批货。 (; ) if you sell sth short or go short (on sth), you sell shares, currencies, etc. that you do not yet own, hoping that their price will fall and you will make a profit by buying them later at a lower price（股票、货币等）卖空地◆Investors who went short on the stock made big profits when the share price fell.股价下跌时，卖空股票的投资者赚了大钱。before the time expected or arranged过早地（中止）◆I'm afraid I'm going to have to stop you short there, as time is running out.时间不够了，恐怕我得就此打断你了。➡ idiom at fall verb, run verb