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。

youdao

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

By convention, the name of a managed bean is the same as the class name, with the first letter of the class name converted to lowercase.

按照约定，托管bean的名称与类名相同，类名的第一个字母被转换为小写。

youdao

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