often [ˈɔːfn] 经常;时常;常常
unsafe [ʌnˈseɪf] 不安全的;危险的;身处险境的

He often dreams of home.
他常常梦见家。

I often go shopping with my mother on weekends.
我时常在周末和妈妈去购物。

We often slept under the stars.
我们经常在夜空下露宿。

It's unsafe for her to go alone.
她单独去是很危险的。

Unsafe to play with fire.
玩火不安全。

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