催化剂是一种能加速化学反应的物质.A catalyst is a substance which speeds up a chemical reaction.各种陶土管用作转化催化剂的载体.Various ceramic materials have been suggested as supports for reforming catalyst.经过泡水试验,催化剂应不开裂或破碎.To pass the water test the...
The Clean Water Act expressly provides that it does not preempt more stringent state law.《洁净水法案》明确规定,该法并不先占更为严格的州法律.They do not preempt the land surface that is useful for other purposes.它们不预先占用对其它目的有用的地面.I advised him a...
航行一直很顺利，直到他们碰上了商船的尾流。The ride was smooth until they got into the merchant ship's wake.我一碰上悲伤的事物就难以控制情绪。I overreact to anything sad.很奇怪,我在这儿碰上他了.It is very extraordinary that I should meet him here....