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关注：1
2013-05-23 12:21
求翻译：认真观察和学习了各种航行设备以及其作用和操作是什么意思？ 待解决
 悬赏分：1
- 离问题结束还有
认真观察和学习了各种航行设备以及其作用和操作
问题补充： |
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2013-05-23 12:21:38
Careful observation and study a variety of navigation equipment and its role and operations
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2013-05-23 12:23:18
careful observation and study the various navigational equipment, as well as its role and operating
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2013-05-23 12:24:58
Earnestly observed and has studied each kind of navaid as well as its function and the operation
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2013-05-23 12:26:38
Careful observation and learning a variety of navigation equipment, as well as its role and operations
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2013-05-23 12:28:18
Have observed and studied various navigation apparatuses and their function and operation conscientiously
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