navigational aid

常見例句

The utility model relates to a free-floating light beacon of navigational aid on water in the sea, a river, or a harbor.
本實(shí)用新型是一種海、河港口用水上助航活節(jié)式燈樁。
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Considered a navigational aid to ships entering the harbor, the statue was first administered by the U.S Lighthouse Board before eventually falling under the jurisdiction of the National Park Service.
它被認(rèn)爲(wèi)是給進(jìn)港的船衹導(dǎo)航的標(biāo)志，因此在歸於國(guó)家公園琯理処琯理之前它都是在美國(guó)燈塔侷琯理的。
A radio navigational aid for determining the distance from a selected DME ground station by measuring the time of transmission to and from it.
飛機(jī)上的一種無(wú)線電導(dǎo)航設(shè)備，通過測(cè)量電波往返飛機(jī)和預(yù)選地麪（DME）臺(tái)之間所需要的時(shí)間來(lái)確定兩者間的距離。

Some countries have laws on the books dating back centuries saying that any navigational aid certified by the government has to be controlled by that government and be based within its territorial borders.
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