A further advantage is that the inclusion of bypass ports and channels integrally in the body of the tool allows high rates of fluid circulation to be passed through the bore without damaging the packer elements which typically have a large outer diameter.

熱心網友

它的更大的一個好處在于機器內部有完整的旁通管和路徑，允許液體高速循環流動，而不會對機器基礎部分造成破壞．最后那個which定語從句實在不曉得說的撒子哈．反正就是外面那一駝東東．