Please move the manhole cover away .请将人孔盖移开。Stainless steel bolts and nuts shall be tightened on manhole covers.人孔盖使用不锈钢螺栓和螺母拧紧.Debus turn head in the manhole 2 to have equipments smoothly entered.在人井2中,将弯头卸下,便于设备进入.How ...
珊瑚是由某些水螅体构成的.Coral is formed by certain types of polyp.水螅虫类生命循环中的无性生殖水螅虫.The asexual polyp in the life cycle of a hydrozoan.在南极边的威德尔海,一只水螅水母伸展它的冷光触须.A hydromedusa spreads its luminescent tentacles in the Weddell Sea near...