2 sentences

1. 我们必须时刻防备可能的危险。

   wǒ​men bì​xū shí​kè fáng​bèi kě​néng de wēi​xiǎn.

   We must always be on guard against possible dangers.

   Source: Dong Chinese Dictionary

2. 由于防备森严，小偷始终没能得手。

   yóu​yú fáng​bèi sēn​yán, xiǎo​tōu shǐ​zhōng méi néng dé​shǒu.

   The thief never succeeded because of the heavy security.

   Source: Dong Chinese Dictionary