As you can imagine this took some time and it was not until 1969 that the dam was completed and three years later that the crest gates were fitted in order to facilitate full usage.
你可以想象这项工程需要花费多长时间，一直到1969年才竣工，而顶部的闸门在三年后才安装完毕，大坝自此才投入使用。
The Morganza Spillway floodgates were opened for the first time in nearly forty years to lower the crest of the flooding Mississippi River.
为降低密西西比河洪峰，近四十年中，摩根萨溢洪道首次开闸泄洪。
When the distance between two wave crest is similar with length of vessel, speed must be reduced in time in order to avoid stem get into wave when vessel is in trough.
当两个波峰的距离和船长接近时更要注意及时减速，以免船舶进入波谷时船首穿入大浪中的危险。
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