So, make sure you not only know these things, but you've experienced them through doing practice tests under exam conditions.

那么就要确保你们不仅知道这些方法，还要通过在模拟考试中练习中实践它们。

(either less or more than three days after diagnosis) rather than a randomised controlled trial in which some patients were given a placebo instead of the treatment under test.

（诊断后少于或多于三天）而不是随机对照试验在对照实验中，一些患者被给予安慰剂，而不是实施治疗。