hard ground短语¹³¹⁶²⁰⁺³ 基本例句 硬防蚀剂,硬地 Because of hard/span> ground surface characters of big bulk densities, bare surface and be disturbed easily, the hard ground surface has its laws about sediment yield. 硬地面由于具有容重大、地表完全裸露、易受人为干扰等特性，因而其产沙特性有其自身的规律。 dictall The boy fell on hard ground and broke his leg. 这个男孩摔倒在硬地上，把腿给弄断了。《21世纪大英汉词典》