你必须花些时间查一查这些寻求帮助的团体，以确保它们是合法的非营利性组织。

You must take the time to investigate the groups behind such pleas for help to ensure that it comes from a legitimate nonprofit.

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这些异常细胞通常要经过10—15年时间才会变成结肠癌。只要定期筛查，息肉完全可以在它们变成结肠癌之前被移除。

It usually takes around 10-15 years for abnormal cells to grow into colorectal tumors. With regular screening, polyps can be removed before they develop into cancer.

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