the quality of being impenetrable (by people or light or missiles etc.)
例句
I tried to erect a facade of imperviousness and self-confidence. 我竭力装出一幅不受外界干扰，十分自信的样子。
The experimental result of imperviousness of asphalt concrete under various load levels is presented in this paper. 本试验侧重于沥青混凝土的防渗性能研究。
Analysis for groution effect and dam observation results show that grouting effect and imperviousness of curtain are satisfactory. 从灌浆成果资料和大坝观测成果资料分析，灌浆处理的效果是好的，帷幕的防渗能力是稳定的。
Cork from Q. suber has many good physical properties, such as low density, well elasticity, heat insulation, sound insulation, imperviousness and damp proof. 欧洲栓皮栎软木具有密度低、弹性好、热绝缘性好、吸声减震和防水等优良物理性能。
An influence of flyash on the compressive strength and imperviousness of concrete is discussed in the paper through the experiments on flyash concrete samples. 文章通过对粉煤灰混凝土试块进行的试验,探讨了粉煤灰对混凝土的抗压强度和抗渗性能的影响。
High density polyethylene (HDPE) film have many advantages, such as high-strength, imperviousness, corrosion resistance, age resistance, convenient to construct, and so on. 高密度聚乙烯膜具有强度高,防渗性能好,抗腐蚀、抗老化能力强,施工方便等优点。
