Never let the water level fall below the base of the tree or the cut end may seal over, preventing further water intake.
不要让水位降到树基以下，或者树干截面以下，否则截面干涸以后，松树就无法充足的吸收水分了。
Her body was discovered when a horse rider spotted her car after a severe drought had caused the water level of Lake Bancalie to fall by 30ft.
她的尸体被一位骑马者发现是在柏卡烈湖（Bancalie）严重的干旱过后，干旱导致湖的水位下降30英尺，她的车才得以显露。
We saw the level of the water fall slightly.
我们看到水面稍稍下降了一点。
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