对这些公司来说，能够在多个平台开展交易，并利用其中的价差进行套利，对它们的交易战略十分重要。

For such firms, being able to trade on multiple platforms and arbitraging between price differentials on them is important to their trading strategies.

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如果中国放松对外国投资者在上海股市交易的控制，并允许国内投资者在境外交易，套利交易会让所有价差不复存在。

If China were to loosen controls on foreign investors trading in Shanghai and on domestic investors trading abroad, any differential could be arbitraged away.

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稳定的市场会减少投资者交易的次数，而且交易员赚取买卖价差的机会也会减少。

Steady markets would give investors fewer reasons to deal, and so traders would have less chance to earn the spread between sell and buy prices.

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