首先
word A2- first of all; in the first place
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首先，它节省了时间，学生不用每天花一个小时在路上。
首先，树木能够吸收灰尘、降低噪音，夏天还能为街道遮阴，使周围的气温下降好几度。
首先，他教奶奶怎么和家人打视频电话。
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