词汇	signal ahead sign
释义	signal ahead sign 前方信号标志
随便看	underwater spring Underwater ssensor networks under-water stability underwater stage decompression underwater stake underwater starting underwater stereoscopic television underwater storage underwater storage tank under water storage tank underwater straightener underwater straighter underwater strain-measurement underwater strand granulator underwater strap-on blasting underwater stroke mechanic underwater structure under-water structure project underwater structures underwater submarine warfare program Underwater Submarine Warfare Research underwater/subsea operation technique underwater surveillance underwater survey underwater survillance