向下兼容

【计】 downward compatibility

向下的英语翻译：

down; alow; downhill; downward
【计】 down
【医】 cata-; deorsum; kat-

兼的英语翻译：

concurrently; double; hold two or more posts concurrently; twice

容的英语翻译：

allow; appearance; contain; hold; looks; tolerate