除草剪刀；专门用于修剪缝隙角落里的青草。Grass shears are specially made to trim grass growing in awkward places.她从窗台上拿起一把剪刀。She picked up a pair of scissors from the windowsill.这把剪刀太沉了。These scissors are awfully heavy....
When this tensor vanishes, the space is calleda flat.当这一张量为零时,空间叫做平直空间.If the circulation vanishes at one instant of time, it must vanish for all times.只要环量在某一瞬间为零, 它就必须永远为零.With this said, the old man vanishes out of si...
我原先不知道这是双片连映.I do not realize it is a double feature.在植入前, 可弯曲的双片补片被拉入导管.Before implantation, the flexible double - disc patch is pulled into a catheter, collapsing and compressing it lengthwise.论述了一种新型、简单、可靠的双片齿轮消除侧隙机构在...