He cleared off when he heard the police siren.

他听到警笛便逃之夭夭。

《牛津词典》

He holed up inside the house and begged his wife to hide him whenever he heard a siren go by.

所以他在自己家里挖了一个大坑，并央求妻子在他听到警笛声时，帮忙将他藏起来。

youdao

Resident Roger Riddle said that when he heard the tornado siren, he rounded up his children and took them to a community storm shelter.

CNN: Severe weather, tornadoes kill dozens across South