核心问题
He then asked when Mr Gilbert would be allowed to go home and the doctor told him that he would have to stay in hospital for another two weeks. (New Concept English, Book 2, L.39) 然后他又问什么时候可以允许吉尔伯特出院，医生说他还得住两个星期。
another 意为“另一个”，显然是指单数，这里为什么能与复数名词 weeks 连用呢？
词典解答
当another与复数名词连用时，它不再作“另一个”解，而作“另外的”“再”“又”（further, additional)解(参见another )。下面再补充一些例句：
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Where shall we be in another ten years? (ALD) 再过十年我们将在什么地方呢?
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I've got another three minutes. (Mansfield) 我还有三分钟时间。
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We have another two rooms for the meeting. (CGEL) 我们还有两个房间供会议使用。
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By working the pumps, we kept the ship afloat for another 40 hours. (CGEL) 我们用抽水机来抽水，使船又漂浮了 40 个小时。
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We intend to stay for a further two months. (CGEL) 我们打算再停留两个月。