他差点错过了公交车，勉强赶上了。

He ___narrowly caught the bus before it drove away.

这项研究仅关注了城市地区的空气污染问题。

The study ___narrowly focused on air pollution in urban areas.

我们勉强从狭窄的缝隙中挤了过去。

We ___narrowly squeezed through the tight gap.