[译] 我想再呆三个星期。
[误] I want to stay for three weeks.

[正] I want to stay for another three weeks.
[注] 数词可以和 another, an extra, a good 及 every 等连用。例如:We'll need an extra ten pounds. 我们需要另外再加 10 英镑。/He's been waiting for a good twenty-five minutes. 他一直等了足足 25 分钟。/I go to Beijing every six weeks. 我每 6 个星期去一次北京。