set sb./sth. free简单

Across 18 trials each, the living rats were 52 percent more likely on average to set the social robot free than the asocial one.

在各18次试验中，活老鼠释放社交型机器鼠的可能性平均比释放非社交型机器鼠高出52%。

It set the trapped rats free.

它放出了被困的老鼠。