Jetometer
润滑油腐蚀性测定器
🗣️ 情景例句
I estimate his age to be about 30.
我估计他的年龄大约30岁。
It is good to be merry at meal.
席间心情愉快是为上策。
It can copy a long report and sort the copies and pin them together.
现它可以复印长篇的报告，把复印件分类，并装订起来。