dangerous的名詞形式的反義詞

　　例句：

　　The equation of wealth with happiness can be dangerous.

　　把財(cái)富與幸福等同起來可能是危險(xiǎn)的。

　　Going into the projects alone is dangerous.

　　只身進(jìn)入公房區(qū)是危險(xiǎn)的。

　　It's known as the most dangerous part of the city.

　　人們都認(rèn)為那是市內(nèi)最危險(xiǎn)的地段。

　　I need hardly tell you that the work is dangerous.

　　這工作很危險(xiǎn)，這就不用我說了。

　　It would be dangerous for you to stay here.

　　你待在這兒不安全。