Why do you look so down in the mouth?你为什么显得这样消沉?Why are you so down in the mouth, anyway?不过,你为什么这么没精打采的?Paul looks down in the mouth because she failed in the attempt.保罗因为尝试失败看起来很沮丧....
Well we need to put by £200 for the pump valves to be renewed.我们需要存下200英镑以备更换水泵阀。The heart has valves to let blood flow in and out of it.心脏有瓣膜控制血液流进流出.The engineering gang fell earnestly to work on jammed valves.轮机组都起劲地埋...
Breather valve and flame arrestor are indispensable safety devices.可见呼吸阀、阻火器是储罐不要缺少的安全设施.So the railroad will buy the spark arrestor.所以铁路将购买阻火器.The railroad will realize that it can save this $ 100 cost by investing $ 50...