ttl
abbr.
through-the-lens (camera-flash monitor) 通过透镜（照相机闪光监视器）;
time to live 生存时间;
生命期;
transistor-transistor logic 电晶体-电晶体逻辑;
例句:
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Check. 11 area TTL autofocus on both?
来自ENGADGET
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The drawback of a pulldown in TTL is that it wastes power.
在ttl中的下拉的缺点是,浪费能源.
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It is much more common to pull TTL inputs up.
常常是拉ttl升.
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The control simulation console converted 27 V electrical signal into TTL electrical signal.
模拟发控台完成导弹27V电平信号 与火控模拟计算机TTL电平信号间的隔离与转换.
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IBM added a dedicated keyboard with a TTL level serial communications port.
来自SA