manual injection meaning in English

手工注射(快速腌肉)

The comparison of anaesthesia effect between the wand local anesthesia appliance and manual injection in vital pulp preparation
活髓牙预备中两种麻醉方式的效果
This is generally more of a problem for manual injections . in the long term , gradual loss of stationary phasefrom the column causes a trend towards shorter retention times
在长时间的使用中，色谱柱固定相的逐渐流失也会使保留时间逐渐提前。