"Vitamin D has become a very hot topic in medicine now as we are discovering very high levels of vitamin D deficiency in our population, not only in the U.S.,but worldwide" Vitamin D helps our bodies absorb calcium and helps form and maintain strong bones.

VOA: standard.2010.05.28

because I know that it's definitely a hot topic.

因为我知道这个话题太热门了。

生物克隆是热点问题 - SpeakingMax英语口语达人

because I know that it's definitely a hot topic.

因为我知道这个话题太热门了。

生物克隆是热点问题 - SpeakingMax英语口语达人