Bill was a senior police officer who joined the forceback in1982.
比尔是一位高级警官，他早在1982年就加入了警察队伍。
2
If an arm is stretched forward under water resistance is increased and a reaction forceback ward is developed both of which would contribute to negative acceleration.
如果手臂在水中是向前伸展则阻力会随之增加而向后方的反作用力也会出现，二者都会产生负加速度。
3
Hand at her mouth she stared while Melanie packed a fresh towel against his shoulder pressing it hard as though she could forceback the blood into his body. but the towel reddened as though by magic.