The cheaper FNDs fluoresce roughly as well as those produced with an electron beam.此种廉价FND所发的荧光与用电子束生产的FND所发荧光大致相同.The radar beam can track a number of targets almost simultaneously.雷达波几乎可以同时追着多个目标.A high quality beam ha...
The lighthouse beam was quite distinct in the gathering dusk.灯塔的光束在渐浓的暮色中清晰可见。He directed the tiny beam of light at the roof.他把那一小束光对准了屋顶。She froze when the beam of the flashlight struck her.当手电筒的光照到她身上时她僵住了。...
John used to divert himself with billiards.约翰过去总打台球自娱.a game of billiards一局台球赛Playing billiards is my chief recreation.打台球是我主要的娱乐活动。Jones simply walked over Brown at billiards.在弹子游戏中,琼斯不费吹灰之力赢了布朗....
The duplicates are attached to each other at a constricted region called the centromere.对偶体彼此相连于称为着丝粒的缩小的区域.Following the replication of chromosomes, resultant chromatids remain attached at the centromere.随着染色体的复制, 着丝粒始终...