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。

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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。

youdao

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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Regaining the confidence to ride aggressively in a tight pack or descend winding slick roads takes time after a crash.

WSJ: Cycling's Occupational Hazard

While Worcester kept things tight, relying on the power of their pack and midfield runners, the Pirates attempted a far more expansive game, half-backs Gavin Cattle and Johnny Bentley constantly looking to run with ball.

BBC: Cornish Pirates 12-21 Worcester

The watch, slightly smaller than a pack of cigarettes, would be a tight fit.

FORBES: Magazine Article