“有效落差”是指那些第一志愿上线生源不足的院校，才会给第二志愿考生录取的机会。所以应把那些近些年出现第一志愿录取缺档的院校作为第二志愿的主要报考对象。
正常有效落差 normal effective head
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然而在海地实施这套有效的控制措施时，却出现极大落差。
Yet, in Haiti, there are vast gaps in the deployment of well-established control measures.
一方面用于放置发电的涡轮，一方面提供足够的落差以有效的驱动涡轮。
To house the turbines that create the electricity and to provide a sufficient head of water pressure to drive them efficiently.
使用该收集装置能有效降低钢管落差，从而降低钢管间的碰撞，消除噪声，并保护钢管表面质量。
The steel tube collector has effectively lowered steel tube falling height, less collision between steel tubes, no noise and raised steel tube quality.
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