一大半

yī dà bàn gōng zī

一大半工资

the better part of salary

zhè jiàn shì yǐ jīng chéng gōng le yī dà bàn

这件事已经成功了一大半。

More than half of this has been successful.

yī dà bàn de shí jiān

一大半的时间

more than half of the time