First, you'll need a non-digital watch in working condition and a sunny day.

首先，你需要一个正常工作的机械表，天气必须是晴天。

youdao

First, you'll need a non-digital watch in working condition and a sunny day.

首先，你需要一个正常工作的机械表，天气必须是晴天。

youdao