Too many companies view marketing plans as little more than an exercise in where and when to buy media placement.

有太多企业仅仅把营销计划视作选择合适时段和场合购买媒介投放的一种活动。

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For those shoppers, it makes sense to know when to buy organic and which conventionally-grown foods are good enough because they already are low in pesticide residue.

他们很有必要知道什么时候买有机食物比较好，因为有些传统食物本身农药残留量很低，所以就没有必要买有机食物。

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You can't sell when there's nobody to buy.

当没有人买的时候，你就不能卖出去。

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When farmers buy their inputs, the store worker uses a mobile phone camera to scan barcode symbols that match the product.

VOA: special.2010.05.11

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

The biggest error DIY investors make is not what to buy, but when to buy and sell.

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Still, some pointed out that a high inventory would give China leeway on when to buy copper.

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For example, I use starc bands to tell me when not to buy and when to wait.

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