一张有效期一个月的洗衣店优惠券(或者任何其它能减轻母亲烦恼的事)，如果家里已经有小孩，那就雇佣保姆吧。
A coupon to do the laundry (or whatever other chore your mom hates) for a month. If you have small children in the family, offer to babysit.
我留下了洗衣粉盒子上的优惠券，这样我下次买时可以便宜些。
I've kept the special coupon from the box of washing powder, so that I can get my next box cheaper.
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