Definition
Time available when one is free from work or other duties.
空閒時間
She uses her spare time to learn new programming languages.
她利用空閒時間學習新的程式語言。
I enjoy reading novels in my spare time.
我喜歡在空閒時間閱讀小說。
They go hiking together in their spare time.
他們在空閒時間一起爬山。