The utilization rate of licensed spectrum is very low in the time domain, frequency domain and space domain, while the unlicensed band is overcrowded seriously.

大部分授权频段在时域、频域和空间域的利用率很低，而公共频段出现了严重的频谱拥挤。

youdao

Do not use if imprinted cap band is broken or missing. If symptoms persist for more than 7 days or worsen, contact a licensed health care provider.

如果瓶盖带子丢失或是破损请不要使用，如果症状持续超过7天或是恶化，咨询执业健康专家。

youdao

Do not use if cap band is missing or broken. If you are pregnant or nursing, consult a licensed health care professional before using this product.

如果瓶盖带子丢失或是破损请不要使用，如是孕妇或是哺乳者，使用本品前事先咨询执业健康专家。

youdao

This is a way of transmitting signals in somebody else's licensed band, but without disturbing the licence-holder in any way for the incumbent, a bit like having a bird sitting in your garden.

ECONOMIST: Spectrum policy

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