定于

zhè liǎng zhǒng chǎn pǐn dōu dìng yú liù yuè chū shàng shì

这两种产品都定于六月初上市。

Both products are due to ship at the beginning of June.

xīn qiáo dìng yú jiǔ yuè dòng gōng

新桥定于九月动工。

Work on the new bridge is due to begin in September.