例句與造句

1. The determination of absolute altitudes on the moon meets with difficulties because of the lack of a definite zero reference .
   月球上絕對高度的測定因?yàn)闆]有一個(gè)固定的參照零點(diǎn)，頗有困難。
2. In the repeatability tests the zero reference is basic
   零點(diǎn)的測量對于可重復(fù)性測量是最基本的。
3. It's difficult to find zero reference in a sentence. 用zero reference造句挺難的