During a long vacation, they may make a complicated experiment, carry out an involved investigation or go to a faraway place for some necessary field work.
在长假期间可以做复杂的实验，也可以进行繁复的调查或去远处做一些必须的实地调查。
During a long vacation, they may make a complicated experiment, carry out an involved investigation or go to a faraway place for some necessary field work.
在长假期间可以做复杂的实验，也可以进行繁复的调查或去远处做一些必须的实地调查。
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