最好的;第一流的;优秀的;

It took six days to arrive despite being posted first class.
尽管按第一类邮件投递,还是用了6天时间才寄到。
来源:《柯林斯高阶英汉双解学习词典》For my return journey, I felt I could afford the extra and travel first class.
至于回程,我觉得我能多花点钱坐头等舱。
来源:《柯林斯高阶英汉双解学习词典》Fill in the coupon and send it first class to the address shown.
填写订单,并按一类邮件寄至注明的地址。
来源:《柯林斯高阶英汉双解学习词典》The only guarantee of having a cabin to oneself is by travelling first class.
只有坐头等舱旅行才能保证一个人独享一舱。
来源:《柯林斯高阶英汉双解学习词典》I had just enough time to finish eating before the bell rang and I was off to my first class.
我刚吃完饭铃声就响了,于是我赶去上第一堂课。
来源:《柯林斯高阶英汉双解学习词典》
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