casual

[英][ˈkæʒuəl]

解释:

n.城堡，堡垒

例句:

Casual ethical lapses have to become more risky and painful.
偶然的道德失误会变得越来越危险，越来越痛苦。

A casual listener would have assumed that all these benefits came from reduced mercury.
那些漫不经心的听众可能会认为所有这些利好都来源于减少了汞的排放。