A glass or quartz tube has tungsten electrodes sealed in each end.两根钨丝电极是封在玻璃管或石英管的两端.She sealed the letter.她把信封上了。The milk was sterilized and sealed in bottles.牛奶经过灭菌处理后被封装在瓶子里。She merely filled the containers, sealed t...
我是个孤儿，差不多是靠自己长大的。I'm an orphan and pretty much grew up on my own.他是个孤儿，和他叔叔一起生活。He was an orphan and lived with his uncle.当他的父母在事故中丧生之后, 他便成了孤儿.When his parents were killed in an accident, he became an orphan....