These two parts of the animal take it in turns to act as an anchor, while the other digs further into the sediment.
它的这两个部分轮流充当立足锚点，而另一部分则向沉积物深处挖掘。
No corrosion allowance is required for such parts not in contact with the inside fluid as the outside surface of shell, skirt, support lugs and so on, except for anchor bolts.
对于不同内部介质接触的部件，如外表面、防护罩及支承凸缘等不需腐蚀余度，地脚螺栓除外。
CNN ANCHOR: Now in parts of Africa mobile phones are more than just a convenience, they're a key business tool.
CNN主播：现在在非洲的部分地区，移动电话不仅仅是给人们带来方便，它们是一个关键性的商务工具。
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