2 sentences

1. 他只会开空头支票，从不履行诺言。

   tā zhǐ huì kāi kōng​tóu zhī​piào, cóng bù lǚ​xíng nuò​yán.

   He only makes empty promises and never keeps them.

   Source: Dong Chinese Dictionary

2. 在空头市场中，大部分股票的价格都会下跌。

   zài kōng​tóu shì​chǎng zhōng, dà​bù​fen gǔ​piào de jià​gé dōu huì xià​diē.

   In a bear market, most stock prices will fall.

   Source: Dong Chinese Dictionary