277. While there's no question that continuous stress is harmful, several studies suggest that challenging situations in which you're able to rise to the occasion can be good for you.

英語四級譯文:
盡管人們對持續的壓力有害健康的觀點不加懷疑，卻有幾項研究表明，如果你能在富有挑戰性的境遇中隨機應變，這種境遇將對你有好處。

四級詞匯講解:
本句的主干是studies suggest that while引導的是讓步狀語從句，其中that引導的是主語從句;主句中that引導的是suggest的賓語從句，其中in which引導的in which you're able to rise to the occasion是situations的定語從句。

there's no question的意思是“毫無疑問”。如:
He's the best; there is no question about it，他是最棒的，這毫無疑問。

rise to the occasion的意思是“善于處理突如其來的困難，隨機應變”。

be good for的意思是“對…有益的，有幫助的”。如:
Regular exercises are good for your health.堅持運動有益健康。

英語四級考點歸納:
while常見用法如下:

※ 用于引導時間狀語從句，意為“當……時”。如:
We arrived while they were having dinner.他們吃飯的時候，我們到了。

※ 用于引導讓步狀語從句，意為“雖然，盡管”。如:
While she is just a little girl, she can be extremely diff cult to deal with.她盡管只是個小女孩，卻也很難對付。

※ 用作轉折連詞，意為“而，卻”。如:
Lisa is good at science, while her sister is good at literature.莉薩擅長理科，而她的妹妹則擅長文學。