common trouble的用法和樣例：
例句
- Common failure types in cupola melting, their reasons and removal methods was described.
摘要介紹衝天爐熔化常見故障的種類，產生原因以及排除方法。 - In this paper the common faults and causing rea sons about gear pump of wheel loader are analmd,and the preventive measures are suggested.
對輪式裝載機用齒輪油泵常見故障和產生原因進行了分析，並提出了預防措施。
