如果你想描述老师讲英语发音不准，你可以说: "My teacher has inaccurate Engpsh pronunciation." 或者 "My teacher's Engpsh pronunciation is not accurate." 这样可以很清楚地表达出你的意思，并且使用的词语也很地道。
如果你想给老师一些建议，你也可以说: "I think it might be helpful for my teacher to work on their Engpsh pronunciation." 或者 "Perhaps my teacher could improve their Engpsh pronunciation with some practice." 这样你就可以礼貌地给老师一些建议，同时也不会冒犯他们。
总之，重要的是要让你的意思清楚，并且尽量使用地道的表达方式。
如果你想给老师一些建议，你也可以说: "I think it might be helpful for my teacher to work on their Engpsh pronunciation." 或者 "Perhaps my teacher could improve their Engpsh pronunciation with some practice." 这样你就可以礼貌地给老师一些建议，同时也不会冒犯他们。
总之，重要的是要让你的意思清楚，并且尽量使用地道的表达方式。