如果旅行的话，要把握精确的方向，记得带上你的护照和票，出门前先确定下航班，并且非常小心的给你的行李做好记号。

If traveling, get accurate directions, remember to bring your passport and ticket, call the airline before you leave the house, and mark your luggage very carefully.

youdao

请对每个未知电流标以方向和字母记号。

Assign a direction and a letter to each unknown current.

youdao

请对每个未知电流标以方向和字母记号。

Assign a direction and a letter to each unknown current.

youdao