徒步后，他腿部的关节感到僵硬和疼痛。

After hiking, his ___joints in the leg felt stiff and sore.

肩关节让手臂能自由活动。

The ___shoulder ___joints allow the arms to move freely.

水管工正在检查排水管的连接处，看看是否有漏水。

The plumber is checking the ___joints of the drainpipe for any leaks.

他们在公园里偷偷抽了一支大麻烟。

They secretly smoked a ___joint in the park.