Use a one-element array to add a single user name.
可以使用一个元素的数组来添加单个用户名。
First, find out whether or not the problem is specific to a single user.
首先,找出问题是否特定于某个用户。
They went from 40 to 4,000 servers in a few days, without losing a single user.
在短短几天内,其服务器数量从40台增至4000台,而没有流失一个客户。
GetDouble If you just want a single letter from the user, GetDouble.
如果你想得到一个单独的字母,用。
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