2 sentences

1. 门闩牢牢地插在闺门上。

   mén​shuān láo​láo de chā zài guī mén shàng.

   The bolt was firmly set on the door of the women's quarters.

   Source: Dong Chinese Dictionary

2. 你应该牢牢记住这次教训。

   nǐ yīng​gāi láo​láo jì​zhu zhè cì jiào​xun.

   You should keep this lesson firmly in mind.

   Source: Dong Chinese Dictionary