They say longer term study is needed.

他们表示，这需要更长时间的研究。

On the other hand, much of the information we have on the adverse effects of smoking comes from long term studies, with cancers appearing much later in life.

另一方面，我们所掌握的关于吸烟有害的大部分信息都来自长期研究，这些研究都表示吸烟的人晚年会有患癌症的风险。

The drugs haven't been out long enough for there to be long term studies on them but vaccine makers are experimenting with booster shots intended to give people additional protection.

这些药物上市的时间还不够长，并未进行长期研究，但疫苗制造商正在试验加强注射，旨在给人们提供额外的保护。

On the other hand, much of the information we have on the adverse effects of smoking comes from long term studies, with cancers appearing much later life.

另一方面，我们掌握的关于吸烟不良影响的大部分信息都来自长期研究， 癌症出现的时间很晚。

When it comes to sleeping, a long term study found that men who got less than 6 hours a night were 4 times more likely to die over the 14 year period of the study.

在睡眠方面，一项长期研究发现，在14年的研究期间内，每晚睡眠时间少于6小时的男性，死亡的几率是别人的4倍。

Last year, Doctor Chan reported that a long term study of almost 50000 men showed that aspirin can help prevent colon cancer, But the effects required at least six years of regular use.

表明阿司匹林可以帮助预防结肠癌，但效果需要至少六年的定期使用。