1. Introduction  
2. Scene-Image Multi-modal Machine Translation  
2.1 Model Design  
2.2 Model Training  
2.3 Model Analysis  
3. Other Types of Multi-modal Machine Translation  
3.1 E-commerce Product-oriented Machine Translation  
3.2 Text Image Machine Translation  
3.3 Video-guided Machine Translation  
3.4 Multi-modal Simultaneous Machine Translation  
3.5 Multi-modal Chat Machine Translation  
4. Datasets  
5. Evaluation  
6. Comparison between Existing Models  
7. Future Directions  
8. Conclusion