Unfortunately, the mobile device market is much more fragmented than the PC market, making it difficult and cost prohibitive to buy and maintain a huge stable of physical test devices.

遗憾的是，与PC市场相比，移动设备市场非常零散，因而很难购买和维护非常稳定的物理测试设备，并且成本也较高。

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There are many types of PC endurance plate on the market, different price, it is difficult to choose and buy when cause consumers to buy.

市场上pc耐力板的种类繁多，价格各异，导致消费者购买的时候难以选购。

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Challenged as to why he was willing for Chelsea to play so much for the player, José explained: "The English market is crazy, that's why it's so difficult to buy English players from English clubs."

当何塞被问及为何他愿意花如此一大笔钱为切尔西买进小赖特时，他解释道：“英国的市场是疯狂的，那就是为什么从英国俱乐部买进本国国脚总是很困难的原因。

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But Ms. Ting says there's a problem with modified market weighting: It gives undue influence to small stocks that may be difficult to buy and sell because they're thinly traded.

WSJ: Single-Country ETFs: Risky Ventures

This is the basics of market-timing in an environment that it is difficult, and some say impossible to buy at the lows and to sell at the highs.

FORBES: Overvalued Fundamentals And Overbought Technicals Means It's Time To Look To Reduce Market Exposures