The products adopt non-contact type radio frequency card, which is safe, convenient, and reliable and can be enlarged and compatible.

我们的校园一卡通采用非接触射频卡，安全、方便、可靠，并充分考虑可扩展和兼容性。

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For instance, the Army bought so many of one type of tactical radio over the last 30 years that there are actually more of that type of radio in the force than there are soldiers.

FORBES: New Radio Could Revolutionize Combat for U.S. Forces

Dr Hewish is also scathing: he believes that the Oxford team is simply building a type of conventional radio antenna called a waveguide.

ECONOMIST: Physics

CowView uses a type of RFID (radio frequency identification) called UWB (ultra-wideband) technology.

BBC: RTLS: The technology tracking cows to make them happy