strenuous
adj
1 making great efforts; energetic 努力的; 精力充沛的
strenuous workers 干劲十足的工作人员
make a strenuous attempt to reach the top of the mountain 力求登上山顶.
2 requiring great effort 必须努力的
a strenuous itinerary 艰难的旅行路线
strenuous work 累人的工作
lead a strenuous life 过艰苦的生活.