翻译：那位老人的子女不明白，从市场买菜更便宜，他为什么还要费大劲自己去种菜。（take the trouble to

The old man's children do not understand why he take the trouble to grow vegetables when it is cheaper to buy food from the market.

The old man's children do not understand, cheaper to buy food from the market, the cost of his own great efforts to vegetables

The old man's children dont understand,it's cheaper to buy vegetables from the market,why he takes the trouble to grow vegetables by his own great efforts .

Son or daughter of that old people does not know , buy a dish from the marketplace cheaper, his big why want self to go and grows vegetables too wasteful strengths