紧盯

wǒ zuò huǒ chē shí jǐn dīng zhe wǒ de bāo

我坐火车时紧盯着我的包。

I kept a close watch on my bag as I sat on the train.

tā men yī gè gè dōu jǐn dīng zhe bù mǎn tiě dīng de xiàng mù láo mén

他们一个个都紧盯着布满铁钉的橡木牢门。

All with their eyes intently fastened on the iron-clamped oaken door.