first kind ; first species
·2,447,543篇论文数据,部分数据来源于NoteExpress
请给我拿三张第一类邮件的邮票。
Could I have three first-class stamps, please?
《牛津词典》
邮局已承诺在星期五恢复该地区第一类邮件的递送。
The post office has promised to resume first class mail delivery to the area on Friday.
《柯林斯英汉双解大词典》
第一类朋友只是泛泛之交。
The first type of friend is just an acquaintance.
youdao
That's one class of problems.
这是第一类问题
耶鲁公开课 - 基础物理课程节选
应用推荐
模块上移
模块下移
不移动