内部循环和厚层泥土的缺乏导致动植物稀少，无法创造真正的微气候环境。
The quality of water is really bad, lack of inner current and thick layer of mud prevent valuable flora and fauna from creating an actual micro-cosmos.
血管横向阻抗是血液动力学的重要参量之一，但人们对横向阻抗的研究却相当缺乏，相关的实验数据也很稀少。
The arterial transverse impedance is an important hemodynamic parameter, but studies and experimental results on which are much lacking.
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