短语词组短语breaker bottom 开荒犁体;破土犁体sod breaker bottom 草地破土犁体breaker bottom detail 破土犁体blackland middle breaker bottom 重粘土双壁开沟犁体breaker bottom plow 新垦板犁sod breaker bottom detail 草地破土犁体prairie breaker bottom 草原破土犁体 返回 bottom breaker