从下面六个问题中选择一个作出简短回答，字数不超过150。1. What need translators pay attention to in translating technical terms or specialized vocabulary for traffic and transportation engineering?2. What principles may be adopted in guiding translation of materials for traffic and transportation engineering?3. What steps are involved in translating long and complex sentences in ETTE?4. What are the difficult points in translating technical standards for the railway industry?5. What need translators take into account in translating public signs for roads and traffic?6. What are the main stylistic features of ETTE (English for traffic and transportation engineering)?