focus and difficulty的用法和樣例：
例句
- In design of HDD suspended by AMB, it is one, of difficulty and emphases that active control for rotor according as the signal of displacement.
在磁懸浮硬碟設計中，感測器檢測的轉子位移信號是控制器對軸承進行主動控制的依據，是整個系統研究的重點和難點之一。 - The influence of metro construction on neighboring buildings is becoming the emphasis and the difficulty in metro engineering.
地鐵施工對近鄰建築物的影響已成為地鐵工程中的重點和難點。
