You cannot take a day off without authorization.未经批准你不得休假。It's annoying to have to get authorization for spending such piddling amounts of money.花这麽一点钱也要去请示,真烦人.Formal authorization for the trip was given last week....
You may not enter the security area without authorization.未经批准不得进入警戒地区。Formal authorization for the trip was given last week.这次行程上周得到正式批准.Anglers are required to obtain prior authorization from the park keeper.垂钓者必须事先得到公...
锕射气氡的一种放射性的, 惰性的和气态的同位素, 其半衰期为3.A radioactive, inert, gaseous isotope of radon, with a half - life of 3.92 seconds.讨论了该离子交换法在分离锕 - 镧系元素上应用的可能性.The possibility of its potential application is discussed for separation of a...