记下的英文短语有：mark down、write down.

writev. 书写; 写字; 写作; 作曲; 编写; 写信;

markv. 做记号; 做标记; 留下痕迹; 弄污; 使有污点; 标明方位; 标示;

down：adv. 向下; 朝下; 在下面; (坐、倒、躺)下; 在较低水平; 下降; 下跌。

相关介绍

On the morning before starting the fast, write down your starting weight

早晨开始禁食前，记下你的体重。

Write down some notes on the new things that you learned in the unit.

记下你在本单元学到的新东西。

If you see a traffic accident, mark down the licence of the car.

如果你看到交通事故，务必记下汽车的牌照号码。

Use this column to mark down how much each item costs.

用这一栏记下每一项的费用。

Because you are not a staying guest of this hotel, I'm afraid we have to mark down your passport number before we can keep your luggage here.

因为您不是酒店的住客，在我们为您保存行李之前，恐怕我得记下您的护照号码。