hēi
嘿，老张，快走吧！
hēi, lǎo zhāng, kuài zǒu ba!
Hey, Old Zhang, let's go quickly!
嘿！我说的你听见没有？
hēi! wǒ shuō de nǐ tīngjiàn méiyǒu?
Hey! Did you hear what I said?
嘿，咱们生产的机器可实在不错呀！
hēi, zánmen shēngchǎn de jīqì kě shízài bùcuò ya!
Hey, the machines we produce are really quite good!