They can get in and out of the market.

他们可以进出市场。

Keep your money in the market, you know, over a 40-year time period, it's likely to have a better return than trying to go in and out of the market.

把你的钱留在市场上，你知道，在 40 年的时间里， 它可能比试图进出市场有更好的回报。