| 单词 | navigational aid |
| 释义 | navigational aid The idea of sunstones as a navigational aid was first raised in the 1960s, but historians rejected the theory because of a lack of archaeological evidence. Times, Sunday Times Completed in 1860, it remains a navigational aid, nightly casting its beam beyond the dangerous shoals of the inlet. Globe and Mail The airport had a radar system installed, but this was used solely for monitoring traffic and was not seen as a navigational aid. Retrieved from Wikipedia CC BY-SA 3.0 The plane remained there for 64 years, earning its nickname, and the wreckage was used as a navigational aid. Retrieved from Wikipedia CC BY-SA 3.0 In the late 17th century a lead-covered dome (cupola) was added to the castle's stair turret as a navigational aid or daymark. Retrieved from Wikipedia CC BY-SA 3.0 |
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