如果玩家还没有购买并安装游戏，那么仍然可以要求他们先进行注册，然后才允许他们访问站点内容。
If he has not purchased and installed a game, you still might require them to register before you give access to premium content.
在安装时，所有这些支持文件都“最好要有”，而没有严格要求一定要有。
As it happens, all of these supporting files are "nice to have" and not strictly required.
他收到了一台安装了新硬盘的电脑，并付了一笔不菲的费用，然而却没有得到他要求的重要文件。
He received the computer with a new drive and a hefty service fee but without the critical files he asked for.
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