您要查找的是不是：
- a map designed to assist navigation by air or sea. 为辅助航空或航海而制作的图。
- AtoN is the basic establishment of the sea-route for assisting navigation straightly effecting on the safety of shipping. 航标是航道的基础助航设施,直接影响船舶的航行安全。
- Watch 1 gave out committee member of American aviation radio engineering (RTCA) use as to GPS the performance demand that aviation assists navigation system. 表1给出了美国航空无线电技术委员（RTCA）对GPS用作航空辅助导航系统的性能要求。
- Navigation is difficult on this river because of the hidden rocks. 因为河上有暗礁，所以在这条河上航行很困难。
- The value of your assistance is inestimable. 阁下鼎立相助之功不可胜言。
- It has proved of great assistance in such training. 事实证明，在这类训练中，它很有好处。
- He assist me with my income tax return. 他帮助我填写所得税申报单。
- Computer Assisted Navigation System (CANS) 计算机辅助导航系统
- He refused the proffered assistance. 他拒绝接受向他提供的帮助。
- Despite his cries no one came to his assistance. 尽管他大声喊叫，却没有人来帮助他。
- computer assisted navigation technique 计算机实时导航
- Jack used to assist Mary in her lessons. 杰克过去常常帮助玛丽学习功课。
- The compass is an instrument of navigation. 罗盘是航行仪器。
- You can't rely on his assistance. 你不能指望他能帮助你。
- I can't move this piano without assistance. 没有人帮忙，我可挪不动这架钢琴。
- We are ready to render them assistance. 我们乐意援助他们。
- The theory and practice of aircraft navigation. 航空学飞机航行的理论与实践
- I was glad to be of some assistance. 我很高兴为您效劳。
- Please call if you require assistance. 如果需要帮忙，请打电话。
- Could you give us some assistance with this work? 你能就这项工作给我们一些帮助吗？
