First Class Letter 平信
letter first class
第一类信件
以上为机器翻译结果，长、整句建议使用 人工翻译 。
If you send your letter first class it will get there quicker.
要是你按第一类邮件寄，这封信就会到得快些。
youdao
It might be a good idea to mail the letter first class.
通过一级邮递寄这封信也许是个好主意。
The proposed Forever stamp is good for a first-class letter no matter when you stick it on the envelope.
FORBES: The Bupkes Bond
Although a first class stamp was placed on each letter, it did not cover the total postage cost, so they were held at the sorting office by Royal Mail.
BBC: Wrong postage on Weymouth Pavilion redundancy letters
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