"at the first sign of trouble"是什么意思?

sign at the first desk at the first sign of trouble是什么意思? at the first sign 应该是句俚语吧,请指教. 请翻 but they will take their cars for repair at the first sign of a problems look at the sign的同义句 at the first crossing 英语翻译theylimit the extent to which they participate in an endeavor and are more apt togive up at the first sign of difficulty. onlY the firsT sigN of lifE .{YTNE→ENTY【Enty】} first of all first the first at first的区别 at the first,at first与first的区别 麻烦翻译一下这句One packet in 8 oz of liquid,up to 3 times daily at the first sign of irregularity. Xu Jianguang,director of Shanghai's health and family planning commission,said on Tuesday that flu patients should use antiviral medicine at the first sign of symptoms,Xinmin Evening News reported Wednesday.这句话at the first sign of symptoms应 The first class beings ______ 8 o'clock. A.about B.for C. at （讲解） 英语翻译So how does it work?First you have to sign up to the scheme to be sent a key.The key will unlock one of the bikes,which are kept at docking stations in and around central London只需翻译“First you have to sign up to the scheme to be sign your names at the students' union; sign up for it ; 都是报名的意思? 比较first,at first,in the first placethank you~ 英语翻译“the sign leaned over at a slight angle” Look at the sign.You can( )your car here