他把绳索在柱子上绕了三匝缠紧。
He passed the rope around the post three times to secure it.
在当时，这条铁路是非洲有史以来第三大基础设施工程，紧次于埃及阿斯旺大坝及加纳沃尔特水库。
At the time of its construction, it was the third-largest infrastructure project ever undertaken in Africa, after the Aswan Dam in Egypt and the Volta Dam in Ghana.
由于使用三点式安全带，张紧装置改进了安全带的约束能力，而且保护乘客免受伤害。
With three-point seat belts, the tighteners improve the belts restraining capabilities and protect the occupants against injury.
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