They learned how to trim almost 20 percent off their monthly child care bills during the 30-day "Frugal Family Challenge".
在为期30天的“节俭家庭挑战”活动中，他们学会了如何削减每月近 20% 的育儿费用。
Your challenge: stick with a habit every day for 30 days, and post your daily progress updates to a forum.
你所面临的挑战就是：每天都坚持一个习惯，坚持上30天，把你每天的进程都更新到某个论坛上。
接受30天的挑战。
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