bubble sextant with averaging gear
bubble sextant with averaging gear
[海运英汉词典]
bubble sextant with averaging gear平均机气泡六分仪
是什么意思，bubble sextant with averaging gear的解释，bubble sextant with averaging gear的翻译
bubble sextant with averaging gear
[海运英汉词典]
bubble sextant with averaging gear是什么意思，bubble sextant with averaging gear的解释，bubble sextant with averaging gear的翻译