如果要求门腿宽度大，工作速度较高，或经常吊运重件、长大件，则宜选双梁门式起重机。
If the request gate leg width is big, the working speed is high, or lifts heavy, the long big-ticket item frequently, then chooses the double Liang portal type hoist crane suitably.
走到外面，你可能会在门垫上滑倒，摔断一条腿。
Step outside and you could break a leg slipping on your doormat.
海丝特·白兰举起吊在门口的腿于，敲了一下门；总督的一个家奴应声而至，他本是一个英国的自由民，但已当了七年奴仆了。
Lifting the iron hammer that hung at the portal, Hester Prynne gave a summons, which was answered by one of the Governor's bond-servants; a free-born Englishman, but now a seven years' slave.
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