He won't buy or sell anything.

他不购买或出售任何东西。

youdao

If you're willing to sell, we'll buy.

你愿意卖，我们就买。

《新英汉大辞典》

People buy and sell things on boats.

人们在船上买卖货物。

youdao

This will use government and private money to buy housing loans and other troubled assets that financial companies are unable to sell.

VOA: special.2009.02.13

And keep in mind when Crane wrote those lines too, it was illegal to buy and sell wine in this country.

记住克莱恩写下这些诗句的时候，禁酒令还在适用，买卖酒都是非法的。

耶鲁公开课 - 现代诗歌课程节选

That's misleading because it really doesn't matter when you buy the stock, so you're not supposed to, as a broker, sell dividends.

这是误导,什么时候买股票都没区别,所以作为券商,不应以股利为卖点

耶鲁公开课 - 金融市场课程节选

Disclaimer: This should not be considered a solicitation to buy or sell, nor a recommendation to buy or sell any security.

FORBES: Worried About Investing In 2013? Buy American and Prosper

The best way to protect yourself is to use limit orders when placing an order to buy or sell a stock or an exchange-traded fund. (See How Your Buy and Sell Orders Get Filled for more.) Look at the bid-ask spread and set your price limit at the bid for selling a stock and at the ask for buying a stock.

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With buy and hold the tendency is to buy high and sell low, rather than using the day to day volatility to buy low and sell high.

FORBES: Welcome To The New Bear Market For Stocks