1. half,作限定词或代词、名词或副词,意为“一半,半数,部分地”等 Half of the money was mine.那些钱有一半是我的。An hour and a half is allowed for the exam.考试时间为一个半小时。The glass was half full.玻璃杯半满。2. hall,作名词,意为“走廊,礼堂,大厅”等 I headed for Scott's office down the hall.我沿着走廊直奔斯科特的办公室。The room is at the end of the hall.这个房间在大厅的尽头。3. idea,作名词,意为“想法,构思,主意”等 It would be a good idea to call before we leave.我们出发之前打个电话是个好主意。He already had an idea for his next novel.他已经构思好了下一部小说。4. ideal,作形容词或名词,意为“完美的,理想的,完美的人(或事物)”等 This beach is ideal for children.这个海滩是孩子的理想去处。It's my ideal of what a family home should be.这是我心目中完美的家庭住宅。5. ideally,意为“按照理想的做法,合乎理想地,最适合地,完美地”等 Ideally, we should have twice as much office space as we have now.按照理想的做法,我们的办公室应比我们现有的大一倍。She is ideally suited for this position.她非常适合这个职位。