天上不会掉馅饼

1. • there is no such thing as a free lunch (idiom)

Character by character

• 天(tiān)day
• 上(shàng)up
• 不(bù)no
• 会(huì)be likely to
• 掉(diào)fall
• 馅(xiàn)filling
• 饼(bǐng)round flat cake