"It's open season on smokers," I say.

“很多人正在对吸烟者自由抨击，”我说。

It seems to be open season on teachers now.

现在好像是自由评论教师的开放期。

For him, it is always open season.

对于他来说，这始终是敞开的季节。

You can fish in the open season, but not in the close season.

你可以在捕涝期捕鱼，但过了捕涝期就不行了。

It's open season on China, newly installed as the world's largest emitter of carbon dioxide.

现在中国是千夫所指——最近被冠以世界最大二氧化碳排放国。