定式和ing的区别。用之于本题，在主句事件many people are turning to stockbrokers for help发生后，其对“购买股票”这件事的发生与否并没有直接的影响（buy这个事件是turn to help的状语），即，寻求股票经纪的帮助后，和购买股票是两个步骤，寻求了帮助，也不代表就会产生购买股票的行为（因为最后提到了可以很容易直接购买，所以也许仅仅是寻求股票经纪推荐股票，而不实际购买）。
high rates of straying can be problematic because misdirected fish may interbreed with the existing stock to such a degree that any local adaptations that are present become diluted.
→ lower the overall fitness of subsequent generations.
the neighboring phrase "one day""”which can only sensibly describe competition, not the companies themselves.
“在某一天”具有竞争关系的公司可能会在下一天变成合作伙伴。因此，compete和其身后的one day是有联系的，即，compete one day是一个完整的句子，不能分开安放。
The confusion of costs with rates persists partly because labor rates are a convenient target for managers who want to make an impact on their company's budgets.
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定式和ing的区别。用之于本题，在主句事件many people are turning to stockbrokers for help发生后，其对“购买股票”这件事的发生与否并没有直接的影响（buy这个事件是turn to help的状语），即，寻求股票经纪的帮助后，和购买股票是两个步骤，寻求了帮助，也不代表就会产生购买股票的行为（因为最后提到了可以很容易直接购买，所以也许仅仅是寻求股票经纪推荐股票，而不实际购买）。