2 sentences

1. 他极力掩藏内心的恐惧，不让别人看出来。

   tā jí​lì yǎn​cáng nèi​xīn de kǒng​jù, bù ràng bié​ren kàn chu​lai.

   He tried his best to conceal his inner fear from others.

   Source: Dong Chinese Dictionary

2. 他把那叠秘密信件掩藏在书架的最底层。

   tā bǎ nà dié mì​mì xìn​jiàn yǎn​cáng zài shū​jià de zuì dǐ​céng.

   He hid the stack of secret letters at the bottom of the bookshelf.

   Source: Dong Chinese Dictionary