Use a syringe device to gently water against the wall of the ear canel, then canal.
用一个注射器轻轻地讲水滴入耳道壁。
Experimental Study of Laotongyang Canel Bridge Including Static and Dynamical Performance of The Whole Structure
老通扬河桥静动载试验研究
Application of Hydraulic Pressure Gate Lifting Device in Step Forward in the Check Gate of the Main Canel of Heihe River
步进式液压启闭机在黑河总干渠节制闸上的应用
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