外因通过内因而起作用.External causes become operative through internal causes.FvL突变可能是家族性BCS的内因.FvL mutation may be a underlying pathogenicity of familial BCS.语言的变迁有内因也有外因.Language can change due to either internal or external fac...
毫无疑问他很认真,那可不是闹着玩的。There was no doubt he was serious, it wasn't just playing around.那些男孩并无恶意—他们只是闹着玩罢了。The boys didn't mean any harm—they just did it for a lark.照看15个吵吵嚷嚷的孩子可不是闹着玩的事.Looking after fifteen noisy c...