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- Methods: 156 premolars were collected and divided into two groups.The experimental group was prepared with ultrasonic instrument;the control group was prepared with manual instrument. 方法：收集临床初诊病例156个，按随机化原则分成两组，分别用超声波根管器械和手用器械预备根管并对其预备时间及疼痛发生率进行对比分析。
- Making small models requires manual skill. 制作小模型要手巧。
- Work done by machines has replaced manual labour. 机器生产已经代替了手工劳作。
- Microscopes and telescopes are optical instruments. 望远镜和显微镜是光学仪器。
- Having seen the manual, he pick the extinguisher. 看完了说明书，他拿起了灭火器。
- The hospital imported some surgical instruments. 医院进口了一些外科器械。
- This manual is full of useful tips. 这本小册子里有很多实用的小建议。
- The stethoscope is a medical instrument. 听诊器是一种医疗器械。
- The scientist needs some delicate instruments. 这位科学家需要一些精密的仪器。
- We should not look down on manual labor. 我们不应该轻视体力劳动。
- This instrument monitors the patient's heartbeats. 这台仪器监听病人的心跳。
- Telescopes and microscopes are visual instruments. 望远镜和显微镜是光学仪器。
- The strings are a category of musical instruments. 弦乐器是乐器的一种。
- Our dentist keeps his instruments in trays. 我们的牙科医生将他的器具放在隔底盘内。
- He's as tender as a chicken and not up to hard manual work. 他吃不了苦，胜任不了艰苦的体力劳动。
- The dentist picked up several instruments. 那牙科医生把几把器械收拾好。
- The orchestra tuned their instruments. 乐队在给乐器调音。
- Several members of the orchestra are tuning up their instruments. 乐队中有几个成员正在调他们的乐器。
- A maintenance manual gives diagrams and instructions for repairing your car. 维修手册向您提供修理汽车所需的图表和说明。
- He reflected that the quality of the instruments was good anyway. 他寻思，不管怎样，这些乐器的质量还是不错的。
