一周有一个星期天 A week on a Sunday ; One Sunday a week
有一个星期一
There was a Monday
以上为机器翻译结果，长、整句建议使用 人工翻译 。
有一个星期一，我们进行了检查。
We went through the tests on a Monday.
youdao
We went through the tests on Monday.
有一个星期一，这家商场里的人比往常少。
One Monday, there were fewer people in the shop than usual.
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