宝宝每天都病得很重并且体重在下降的时候，我陷入绝望的深处。

I was in the depths of despair when the baby was terribly sick every day, and was losing weight.

《柯林斯英汉双解大词典》

当你在房间里移动的时候，声音的音量会上升或下降，这取决于你在这些驻波中的位置。

As you move around the chamber, the volume of the sound goes way up and way down, depending on where you are in these standing waves.

youdao

到18世纪40年代，大约是婴儿死亡率下降的时候，这种饮料已经很常见了。

By the 1740s, about the time that infant mortality was dipping, the drink was common.

youdao

When you expand a real gas into vacuum, the temperature goes down.

当一个真实气体，向真空膨胀咱的时候温度会下降。

麻省理工公开课 - 热力学与动力学课程节选

As you start on the top and go down, your acceleration is negative.

当你在顶楼准备下降的时候,你的加速度是负的

耶鲁公开课 - 基础物理课程节选

Remember, you've got to keep track of the sign of acceleration, so if you're picking up speed towards the ground, a is negative, so it will be g plus a, but a is a negative number.

记住,一定要注意加速度的符号,所以当你加速下降的时候,a 是负的,还是 g 加上 a,但是 a 是负数

耶鲁公开课 - 基础物理课程节选