block signal

基本解釋

He says, "It is easy for a patient's hair to get in the way and block the signal" with conventional fNIRS technology.
他說，"如果用傳統(tǒng)的FNIRS技術(shù)，病人的頭發(fā)很容易就擋住紅外線，切斷光譜信號。
A rail automatic block signal system based on the field bus technology is introduced, and its reliability design is explained specially.
介紹一種基于現(xiàn)場總線技術(shù)的鐵路自動閉塞系統(tǒng)，并就其可靠性設(shè)計作了重點(diǎn)闡述。
The paper gives solutions to the problems with lighting circuit of permissive aspect of block signal of existing automatic block section according to relevant specifications.
通過對現(xiàn)有自動閉塞區(qū)間通過信號機(jī)容許信號點(diǎn)燈電路存在問題的分析，根據(jù)相關(guān)規(guī)范，提出解決辦法。

No matter what part of the normal radio spectrum you pick, you will find some material that will reduce, deflect or block the signal entirely.
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Because tunnels block a radar signal, trains rely largely on hard-wired equipment like the box beside the track, which helps drivers and dispatchers talk to each other and controls a machinelike traffic signal, giving the drivers basic commands to stop and go.
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Speeds reached peaks of 16.7Mbps down and 9.4Mbps up with full signal but performance varied wildly, even block to block.
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