中文原文：

你们必须增强学习信心。

错误译文：

You should strengthen your studying confidence.

正确译文：

You should heighten/enhance your confidence in your studies.

翻译加油站：

英语中没有像strengthen one's confidence这样的搭配，也没有像studying confidence这样的搭配。“增强”、“加强”和“强化”表示提高思想意识、信心和警觉时，用 to heighten或 to enhance表达。例如：

1. 这次活动旨在增强公众对禽流感的认识。This activity is intended to heighten public awareness of bird flu.

2. 在本公司员工之中，竞争意识与合作意识都已进一步强化。The sense of competition and the sense of cooperation have both been further enhanced among the staff in this company

“增强”、“加强”和“强化”表示使事物更有力或使体制更有效时，用to strengthen 或 to reinforce表达。例如：

3. 增强国防力量是当务之急。 It is imperative to strengthen our national defense

“增强”、“加强”和“强化”表示改善事物质量，使事物更好时，英语用to improve或to tighten up表达。例如

4. 这个学生正在尽最大力量通过专门训练来强化记忆。The student is doing his best to improve his memory through special training.