If no handlers are found to handle the request, the server will return a 501 error.

如果没有找到处理请求的处理程序，服务器将返回一个501错误。

youdao

Around 1890, these pants were assigned the number 501, which they still bear today.

1890年前后，这些裤子被编号为501，这一编号一直沿用至今。

youdao

The size of the cache grew to 501 MB, roughly the size of the file I used in my test, 473 MB.

缓存的大小飙升到 501 MB，接近我在测试中使用的文件的大小（473 MB）。

youdao