Since air has weight,it exerts force on object immersed in it .怎么翻译啊

Since air has weight,it exerts force on object immersed in it .怎么翻译啊 谁能帮我翻译一下这两个句子?英译汉.since air has weight, it exerts force on any object immersed in it.Hydrogen burns in air or oxygen, forming water. 翻译He has put on weight since I last saw him A bottle weighs more after air is put in ,________proves that air has weight.A we B it C which Dthat 求详解,感激不尽. 关于since 用延续性动词He must have taken the book since it isn't here.he has put on weight since he gave up smoking since 主句不是只能跟延续性动词吗 这两句中为什么是短暂性动词 翻译I'm happy to report our use of air sickness bags has declined since we quit serving meals. Since the earthquake hit Japan,polluted air and water has been a r------------to public health.根据首字母填空 帮忙做一道改错题：A container weighs more after air is put in,（it） proves that air has weightA container weighs more after air is put in,（it） proves that air has weight这里面的it为什么错了,应该改成什么? 英语句子挑错.四个选项,看错在哪个,麻烦解释一下为什么错了.　　46.A (A)container weighs (B) more after air is put in (C),it (D) proves that air has weight. has since been since before ,since ago 语法解析1 请问 在现在完成时态里面 since 5 years before ,since 5 years ago 那个对?还是都正确,讲解下.2 写个句子The air conditioner was turned on 5 hours ago.The air conditioner has been turned on si 完形填空!everyone 1 air.air is all around us.it’s around us w……everyone 1 air.air is all around us.it’s around us when we go and play.since we were born,air has been around us on every side.2 we sit down,it’s around us.when we go to bed 帮我解释以下短语1.work on air要怎么理解为兴高采烈?She has been walking on air ever since she won the competition.其中walk为何加ing,2.hapy as a clam 怎么读? 一个选择翻译题3．Air has weight, ________ it is very light. A．though B．even if C．no matter D．whatever 请翻译. they have been in nanjing since ______.A.three weeks B.three days before C.four months agoD.next weekseveral days has passed _____ the air carsh happened.A.since B.after C.as D.before · 英语翻译Five RCTs assessed the efficacy of a robotic treadmill device called the Lokomat.The Lokomat is a motor driven exoskeleton device that employs a body weight support suspension system and treadmill and has been commercially available since 英文三角函数2题...1.Suppose there is a weight hanging from a spring.(We consider an idealized situation in which the spring has perfect elasticity and friction,air resistance,etc.,are negligible.) The weight is given a push to start it moving. 英语翻译　　Pollution Haze　　Recently,the topic of air pollution has again aroused more and more attention since pollution haze,a kind of weather,has appeared increasing frequently in our cities.Just as the picture showed,when pollution haze