in under 90 seconds是什么意思?in和under在这里各表示什么意思?

in under 90 seconds是什么意思?in和under在这里各表示什么意思? in seconds啥意思 in seconds造句 complete level in 60 seconds是啥意思 Watertightness resistance of the overmolded grommet under 150mbar pressure during 2 seconds in the opposite way from assembly.grommet 这个是橡胶件的意思,150mbar 这个是压力单位毫巴 为什么这两个介词连在一起使用呢?下面这句话为什么 in 与 under 这两个介词要连在一起使用呢?不然单用 under He is the only person who has run two 100-meter races in under 9.8 seconds. sixty seconds in a minute in fifteen seconds 的造句 bytes received in 0.003 seconds in fifteen seconds的造句 一道英语的选择题Mike only puts his hands _____ the water for a few seconds.A.under B.in C.of D.behind 请问是under discussion or in discussion? 英语翻译接着是：medal with a record-time of 12.91 seconds in the Athens Olympic Games There're ( )seconds in a minute. seconds count in an emergency什么意思? there are sixty seconds in a m____ in 12 seconds 的中文意思 in seconds汉译英 要求精炼,准确!