As the shells penetrate the waves, a line spools out, not unlike a weighted fishing line, and drops 1, 200 feet under the water.
炮弹穿透海浪，线圈展开(而不像绑有铅锤的鱼线)，沉入1200英尺水下。
Differential pressure remote water gauge should have pressure supplement function to ensure an actual indication of water line in the bubbles under all kinds of working circumstances.
差压式远传水位表应具有压力补偿功能，以保证各种工况下都能显示汽包中真实水位的变化。
Revetments protect the space from dam crest to the line a certain distance, normally 2.5m, under the minimum water level of the dam upstream.
护坡覆盖的范围，上游由坝顶护至水库最低水位以下一定距离，一般在最低水位以下2.5米。
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