代表全市参加英语演讲比赛
-> take part in the English Speech Contest/Competition representing ..City
treat guests with delicious food
-> 用美味可口的饭菜招待客人
把最新的消息提供给sb
-> provide updates to sb.
精力充沛且知识渊博的科学家
-> an energetic and knowledgeable scientist
press one's face against the window
-> 某人将脸靠于窗上
做sth感觉紧张
-> be/fell nervous with doing sth.
处理上百万的难题
-> deal with / handle millions of difficulties
因为sb的死感到痛苦
-> feel painful about sb.'s death