周二下午，我们班开展了一次有意义的公益活动。
On the Tuesday afternoon, our class carried out a meaningful public service activities.
上周一我们班开展了一次有组织的旅行。
我们在187个国家中开展了每年一次的各年龄人群乳腺癌与宫颈癌评估。
We undertook annual age-specific assessments of breast and cervical cancer in 187 countries.
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