Futures prices recovered from sharp early declines to end with moderate losses.期货价格在早盘深幅下跌后出现反弹，收盘时未见严重损失。A question mark hangs over many of their futures.他们的不少期货都还是个问号。Cotton futures are selling at high prices.棉花期货交易的卖价...
它的潜伏期有多长?How long is its latent period?该病有长达11天的潜伏期。The illness has an incubation period of up to 11 days.潜伏期通常为8-14天.The incubation period usually is 8 to 14 days....
现在天气冷极了，地面都冻硬了。It was bitterly cold now and the ground was frozen hard.把它冻硬，但是不要硬得像石头一样。Freeze it only until firm but not rock solid.雪橇在冻硬了的雪上顺利滑行.Sledges run well over frozen snow....