?自由下潜
... 自由旋转：Free rotation 自由下潜：untethered dive 自由涡轮燃气轮机：free-turbine engine ...
Having logged over 6, 000 hours underwater, she is a seasoned aquanaut and even holds the record for the deepest untethered solo dive, at a depth of 1, 000m.
CNN: Quest for exploration
英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。