门禁森严 meaning in Chinese

the gate is strictly guarded.; with the entrance carefully [heavily] guarded

Dday break , we left for tainan prison , which is set in a beautiful environment of blossoming flowers , and is known for its strict isolation from the outside world
中午休息后，同修们接著来到台南监狱。台南监狱虽以门禁森严而闻名，但所内百花放环境优美。
The celts believed that on the night before the new year , the boundary between the worlds of the living and the dead became blurred as the dead searched for the afterlife
塞尔特人相信在新年的前一晚，阴间和阳间的大门不再门禁森严，此时阴间的鬼魂会趁机跑出来，为阳间的人们带来厄运。
Though strictly guarded , the detention and classification center is like a junior high school , where most students are under age eighteen , with some only ten . they wear uniforms and are no different than regular school students
此观护所除了门禁森严之外，事实上好像一所中学一般，学员都是未满十八岁的少年，甚至有十岁左右的小孩，他们穿着一般中学生的制服，与一般学校的学生没什么差异。