420. There is no doubt that students who are athletically inclined will reap the most benefits from a policy that requires physical exercise to be part of every school day.
如果制定一項政策，規定學生在校期間必須每天鍛煉身體，毫無疑問，受益最多的將是那些有運動細胞的學生。

六級詞匯講解:
there is no doubt that...使用了一個主語從句，表示“毫無疑問的是……”，who引導定語從句，修飾students；that同樣引導定語從句，修飾policy。reap意為“獲得，得到報償”，reap profits/benefits from/through意思是“從……獲得利潤/利益”。也可以使用以下這些句型表達同樣的意思：
There is no denying the fact that...
No one can deny the fact that...
No one can doubt the essential fact that...
It is indisputable that...

句型拓展:
It is an undeniable fact that using tobacco will be harmful to your health.
毫無疑問，吸煙有害健康。
There is certainly no denying that stricter penalties may to some extent bring down the number of accidents on motorways as a deterrent to driving offences.
毫無疑問，更為嚴厲的懲罰在一定程度上可以遏制違章駕駛，從而減少高速公路上的事故數量。
No one can deny the fact that a person's education is the most important aspect of his life.
沒有人能否認教育是人生最重要的一方面。