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.
我不想去那家餐厅，首先，它太贵了。
They decided to cancel the picnic; for one thing, the weather forecast predicted rain.
他们决定取消野餐；首先，天气预报预测会下雨。
He didn't apply for the position, for one thing because he lacks the relevant experience.
他没有申请这个职位，首先因为他缺乏相关经验。