two millionths of a second的意思是什么

two millionths of a second的意思是什么 second的意思是什么? second hand 的意思是什么 Nowadays___[two third/two thirds/two three/second three] of Mr.second的中文意思是什么 the second of two things or people already mentioned什么意思? hundreds of a second tenth of a second second later,after a while的意思 in a split-second的意思? have a second idea的意思 one-four-hundredth of a second--什么意思