Along with the lowering of the load capacity of the derrick, the strain parameters of the structure change accordingly.
与承载能力降低的同时，井架结构的应变参数也发生相应的变化。
The dwasera of the derrick was due to the careless heachdling of the ship's crew in lowering the derrick;
该吊杆的损坏是由于该轮船员在将吊杆放低时因操作不慎而变成千斤索越过棘轮，钻井压缩机。
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