1·Detailed video presentations illustrate the techniques of passing instruments, suctioning, and retracting during actual patient treatment.
详细视频演示说明了通过技术手段，吸痰，并撤消在实际住院治疗。
1·These tend to be caused by reaching for one key without fully retracting the other fingers.
这些往往会导致在没有完全缩回其他手指的时候，敲到一个键。