英语翻译certain messenger molecules fight damage to the lungs from noxious air by telling the muscle cells encircling the lungs' airway to contract.This partially seals off the lungs.An asthma attack occurs when the messenger molecules are activa

英语翻译用certain造句 英语翻译certain experiences certain certain certain 英语翻译重点：past a certain point 英语翻译a dedicated building on certain days. 英语翻译I like to make fun of certain things,certain people,even myself.这句话中的certain该怎么翻译? 英语翻译certain rocks proceeded the earliest knowledge of electricity 英语翻译 That he will come to the party is certain 英语翻译A,inspired B,certain C,calm D,satisfied 英语翻译in a certain store where they sell puddings. certain意思 a certain Certain是什么意思? on certain certain days 英语翻译They will limit their teaching to certain subjects only.句子不长,就这一句,