中午之前，四名枪手袭击了保护美国驻伊斯坦布尔领事馆入口的一个警察检查站。

Before midday, four gunmen attacked a police checkpoint protecting the entrance of the Istanbul U.S. Consulate.

youdao

为了保护校园中涂有标语的围墙，蒙面者们手持棍棒守卫在雅典理工大学入口。

Masked men wielding clubs guard the entrance to the Athens Polytechnic University, keeping watch over the graffiti-covered walls on campus.

youdao

为了守卫气孔，这些年老雌性蚜虫会用粘腊将自己和入侵者们黏在一起，封堵入口以保护虫瘿内的幼虫及可繁殖蚜虫。

They defend the pore by gluing themselves to intruders, blocking the entrance and protecting the younger, fertile insects cloistered within.

youdao