strenuous

He seldom engages in activities more demanding than changing television channels.

他很少參與比換電視頻道更費力的活動。

His physician advised him against engaging in any intense physical activity.

他的醫生建議他不要從事任何劇烈的體力活動。

Throughout the conflict, the government exerted substantial efforts to conceal the extent of civilian casualties.

在整個衝突期間，政府付出了巨大的努力來掩蓋平民傷亡的程度。