常見例句雙語例句Upper section composed of driving sprocket upper casing with rails(double chain) and discharging outlet.上部區(qū)段，由傳動(dòng)鏈輪及帶有軌道（雙排鏈）的上部機(jī)殼、卸料口組成。Applying pump pressure then activates a sliding collar that opens access ports, enabling circulation across the upper casing interval.然后施加泵壓，使滑動(dòng)箍啟動(dòng)，于是使進(jìn)入口開啟，從而能夠穿過套管上段進(jìn)行循環(huán)。www.infopetro.com.cnUpper casing, as a key part in the driving system of helicopter, is difficult to be formed owing to its complex geometry and high demand for property.上機(jī)匣為直升機(jī)傳動(dòng)系統(tǒng)中的關(guān)鍵零件，幾何形狀復(fù)雜，性能指標(biāo)要求高，成形難度大。 返回 upper casing