dàn shì
他想睡一会儿，但是睡不着
Tā xiǎng shuì yīhuìr, dànshì shuì bù zháo
He wants to sleep for a while, but can't fall asleep
他虽然已经七十多了，但是人仍然很健旺。
Tā suīrán yǐjīng qīshí duō le, dànshì rén réngrán hěn jiànwàng.
Although he is already over seventy, he is still very healthy and vigorous.