The incidence was compared for participants and nonparticipants.
对比参与者和为参与者之间的发生率。
When travel back through time occurs this is not recorded in the memory of nonparticipants, only in the memory of the travelers.
当发生回到过去时,这不会在未参与者的记忆中记录下来,仅存在于旅行者的记忆中。
For safety, the basic skills area should be well lighted and, if possible, completely netted to keep balls from getting away and hitting nonparticipants.
安全起见,基础技能训练区要保证光线充足,可能的话要用挡网包围,防止球乱飞砸到人。
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