time前面加什麼介詞|free

前面加介詞in，例如：

1、In your free time， explore all that this incredible city has to offer.您可以在閒暇時間探索這座美妙城市的各種風情。

2、External recovery refers to actions that take place outside of work — e.g. in the free time between the work days， and during weekends， holidays or vacations.外在恢復指的是工作之外發生的行為——例如，工作日之間的空閒時間以及週末、公共假期或其他假期。

3、Once I had a boy who worked experimentally with Tinkertoys in his free time.曾經我遇到了一個男孩，他在業餘時間用萬能工匠做實驗。