• 1. take four classes: 上四节课

• 1.Parents can take babies as young as four months to water orientation classes, and group swimming classes can start at age three.
  从孩子4个月开始，父母亲便可以带去参加亲水课程了，等到3岁，就可参加集体性的游泳训练课了。
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• 2.For all classes of antidepressants, patients must take regular doses for at least three to four weeks before they are likely to experience a full therapeutic effect.
  无论何种抗抑郁药物类别，患者必须持之以恒服用3 - 4周，然后他们才可能体验到完全的治疗效果。
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• 3.I have four academic advisors who give good advice about what classes to take.
  四位学术导师给了我很多良好的建议。
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