二十八可以被七整除。
该余数与 0 比较（如果余数是 0，那么该数可以被 3 整除）。
That remainder is compared to 0 (it is the remainder 0 and, thus, num is divisible by 3).
该筛选表达式将产生一个整数序列，其中每个整数都小于1000且能被3或5整除。
The filter expression will result in a sequence of integers where each is less than 1,000 and divisible by 3 or 5.
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