B
生物医药大词典
by MedSci
菜单
词典
分类
百科
诗词
背单词
英文名
DeepEvidence ↗
确认登录状态…
例句 /
The soil has a substratum of rock.
The soil has a substratum of rock.
这土壤下面有层石头。[这土壤有下层石头。