standby什么意思

stand-by汉语翻译：【计】 备用设备, 准备, 备用【化】 备用的; 储备的; 辅助的词型变化：名词复数:standbys英语解释：名词 stand-by:something that can be relied on when needed同义词：standby an actor able to replace a regular performer when required同义词...