多次志愿者活动
Many volunteer activities
以上为机器翻译结果，长、整句建议使用 人工翻译 。
志愿者的大脑慢波活动同样在白天和晚上多次被测量。
Thee slow-wave activity in the volunteers' brains was also measured several times during the day and night.
youdao
我曾多次在大型商务和文化活动中担当口译员和志愿者。
I served as a interpreter and volunteer at many business and culture activities.
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