牢牢

zhè diǎn nǐ bì xū láo láo jì zhù

这点你必须牢牢记住。

You must keep this firmly in mind.

láo láo wò zhe

牢牢握着

keep a tight hand on

mù bǎn bèi dìng de láo láo de

木板被钉得牢牢的。

The wood was firmly nailed down.

tā jiāng hào mǎ láo láo jì zài xīn li

她将号码牢牢记在心里。

She lodged the number firmly in her mind.