Members are advised to bring a brown-bag lunch.

建议会员们自带午餐。

《柯林斯英汉双解大词典》

Did everyone remember to bring a bag lunch?

每个人都记得带份午餐了吗？

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If you don't have time to go out, pack a brown bag lunch.

如果你没有时间出去，包棕色袋子午餐。

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He recently received via FedEx a toy rubber sandwich wrapped in red cellophane with a note saying he wouldn't have to brown bag his lunch the following week if he'd let the sender take him to a restaurant.

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