Definition
Used to introduce the first of several reasons or points.
首先；一方面
I don't want to go to that restaurant, for one thing, it's too expensive.
我不想去那家餐廳，首先，它太貴了。
They decided to cancel the picnic; for one thing, the weather forecast predicted rain.
他們決定取消野餐；首先，天氣預報預測會下雨。
He didn't apply for the position, for one thing because he lacks the relevant experience.
他沒有申請這個職位，首先因為他缺乏相關經驗。