unpaired median fin on the backs of fishes and some other aquatic vertebrates that help to maintain balance.
鱼类和其他水生脊椎动物背部帮助保持平衡的奇鳍。

The guide wheels on each carriage are hexagon style wheels that wear up into the wheels to maintain accuracy.
每个锯座上的引导轮为六边形，能够较好的保持精度。

What percentage of our income are we prepared to spend to purchase and maintain our home on a monthly or annual basis?
每月，每年我们计划花多少钱用于购置和维修我们的房子？

maintain a scientific outlook on development and a correct attitude toward our performance, and be realistic and pragmatic in our work
牢固树立科学发展观和正确政绩观，大兴求真务实之风

With branch offices scattered throughout North America and Europe, Razorfish relies on a spirited intranet site called ' Mom ' to maintain order and - just as important - a sense of community.
公司分支机构遍布北美和欧洲，公司建立了一个被称为妈妈网的生机勃勃的内联网，以维持公司的工作秩序以及同样重要的公司集体的观念。