Add the needs and subtract them from the monthly income. The remaining number is the amount of money the teen can spend on wants.

将必需品的花销加总，再将其从月收入中扣除。剩下的数额就是孩子们能花费在他们想要的东西上的余额。

youdao

Add up the amount you spend on housing and transportation every month. Brainstorm ways you can cut those expenses.

计算出你每个月花在房子和交通上的支出，头脑风暴的方式可以帮你减少这些花销。

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Using this technique, you can add additional functions to prompt the user, provide controls for the live region, determine the amount of new content that would be read, and so on.

使用此技术，您可以添加一些额外的功能来提醒用户，为活动区域提供控制，以及确定可以读取的新内容量，等等。

youdao

But the more functions cell phone manufacturers add, the greater the amount of power the phones use and the less practical running them on lithium batteries becomes -- so the race to find a viable alternative is on.

CNN: Search for better phone power