护照过期是无效的.A passport that is out of date is invalid.今天宇航员将会做最后一次尝试，力图把一颗通信卫星从无效的轨道上抢救下来。Astronauts will make a final attempt today to rescue a communications satellite from its useless orbit.此外，他们还声称任何这样的干预都是完全无效的。Further...
我停住脚步，等她追上来。I stopped and waited for her to catch up.她停住转过身，脸上洋溢着幸福。She paused and turned, her face alight with happiness.上尉停住了，站着一动不动。The lieutenant stopped and stood stock-still....
What may be done to reduce the influence of intractable opponents?能做些什么来减少那些难缠的反对者的影响呢？It emerged as the most intractable issue of our era.它成了我们时代最难解决的问题.The economy still faces intractable problems.经济仍然面临着一些棘手的问题。Object...
墨鱼汁把水弄黑了.The ink of cuttlefish beclouded the water.墨鱼熟后, 取出切件,淋上芡汁,趁热品尝.Remove cuttlefish when cooled, slice and serve with the sauce.加调味搅至起胶,加入肥肉伴匀,做成墨鱼丸.Add seasoning to cattlefish and stir until it turns sticky....
介绍了用氨性乙醇作提取剂,从甘草中提取甘草甜素的方法.The method extracting Glycyrrhizin from licorice by using the extraction material of alcohol ammonia was introduced.甘草甜素是从药用植物甘草根茎中提取出来的一种具有多种生理功能的有效活性成分.Glycyrrhizin is a multi - physiological...