strenuous
adj. 费力的，艰苦的；积极的，坚决的
例句
Strenuous efforts had been made to improve conditions in the jail.
为改善那家监狱里的条件已做了艰苦的努力。
《柯林斯英汉双解大词典》
Richard Long's A Line Made By Walking, however, involved nothing more strenuous than a 20-minute train ride from Waterloo.
然而，理查德·朗的《行走的路线》并不比从滑铁卢坐20分钟火车更费力。
She made strenuous efforts to tame her anger.
她竭力压制心头怒火。
《牛津词典》
