I pulled the pint of rye out of my pocket and held it so that he could see the green label over the cap.

我从口袋里掏出一品脱黑麦酒， 拿着它，这样他就能看到瓶盖上的绿色标签。

Well, imagine a company that sells something bad for the environment, like a plastic bottle, but they cover it with a green label that symbolises being environmentally friendly.

想象一下，一家公司出售对环境有害的东西，比如塑料瓶，但是他们用象征环保的绿色标签粉饰它。