Compared with the rolling coupling, the roller coupling has such deficiency as easy to be worn, a low transmission efficiency and difficult to be maintained.

与滚动联轴器相比，滚珠联轴器的传动效率低，容易磨损破坏，维修相对困难。

youdao

So far it's not difficult to see that a positive attitude should be maintained here.

迄今为止，不难看到，应该保持一个积极的态度。

youdao

However, it is found that it is difficult to get the dimensions machined be maintained.

特别是在微孔加工和不导电的超硬材料加工方面更显示出其优越性。

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"The constitutional rules of the game need to be maintained even in difficult times, " he said.

BBC: Constitutional issues could stop Merkel buckling

They are portfolios that must be continuously maintained by real people who face difficult issues when trying to track an index.

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