thorough 的副詞用法寫成 thoroughly。
中文說＂徹底的＂在某種層面上也代表的＂完整的＂概念，所以也可以用 complete（聽發音）這個英文單字，副詞形態為 completely，complete 本身是＂完成的、完整的、完全的、徹底的＂意思，例如中文說徹底的覆蓋翻譯成英文可以說 complete recovery。
徹底英文造句練習
When faced with problems, it should be completely resolved.當遇到問題的時候，應該要徹底解決。
Paul and Anna's marriage completely broken.
保羅跟安娜的婚姻徹底破裂了。
After these things, Fanny thoroughly disappointed to Avril.
經過了這些事情，芬妮對艾薇兒徹底失望。
Carter has now completely changed himself, and even quit smoking.
卡特現在已經徹底改變自己，甚至戒菸了。
Do you want to completely change yourself? Then set the target.
你想要徹底的改變自己嗎？那就定下目標。
After the design of the stylist, Mary completely changed.
經歷造型師的設計之後，瑪莉徹底的改變。
General Manager asked us to completely solve the problem of slow shipments.
總經理要求我們徹底解決出貨緩慢的問題。
After a day of thinking, Mike finally thoroughly figured out the problem.
經過一天的思考，麥克終於徹底想通了這個問題。