With cars moving fluidly in a tight pack even a seemingly innocuous change of lanes may cause a tiny disruption which is propagated backwards for many miles.
汽车在密集的车阵中顺畅行驶时，行车线上一个看似无关紧要的变化都可能会引起向后传播几英里的小小中断。
It 's really wonderful how you managed to pack in so many items in such a tight schedule.
你能在一个如此紧张的日程中安排这么多项目，真是了不起。
As he checked all his equipment, and made sure his pack was tight.
他检查了他的装备来确定他的背包有绑紧。
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