the layer of soil between the topsoil and bedrock 同义词：subsoil,
例句与用法
1.
New irrigation and undersoil heating systems were also installed at the same time as the 2003 work 在2003年的那次大修中，新的灌溉系统和地热系统也被安装上了。
2.
Thu march 3rd it ' s snowing , but there ' s no problem training at cobham because three pitches have undersoil heating 3月3日星期四下雪天，但丝毫不影响在科本的训练，因为这里的三块场地都配有地下供暖系统。
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