essence of water meaning in English

水精华
水之精华

The essence of water - saving in agriculture is to enhance the utilization ratio of water resources
农业节水技术的实质在于提高水分利用效率。
The essence of the kidney ( water ) is to nourish the liver , the liver ( wood ) stores the blood to support the heart , the heat of the heart ( fire ) is to warm the spleen , the spleen ( earth ) transports and transforms the essence of water and grain to supplement the lung , and the lung ( metal ) clears and descends downwards to support the kidney water ? this indicates the relationship of the interpromotion among the five zang organs
肺(金)气清肃下降，可以抑制肝阳的上亢；肝（木）的条达，可以疏泄脾土的壅郁；脾（土）的运化，可以抑止肾水的泛滥；肾（水）的滋润，可以防止心火的亢烈；心（火）的阳热，可以制约肺金的太过，这就是五脏相互制约的关系。