重点讲解：
1. fight back 反击；还击；
He ducked the first few blows then started to fight back.
他躲开最先几拳后便开始反击NVHhJiBb==Wjs9,AcH。
2. interact with 相互交流；相互沟通；
After initiation, the youths started to interact with the older members.
入会仪式后，这些小伙子与老成员开始互动,]bNr]V!AHhea+VsC。
3. make sense 可以理解；讲得通；
On the face of it that seems to make sense. But the figures don't add up.
乍一看，似乎讲得通，但这些数字对不起来#N[Yq08y8HLPhJHtd(k)。
4. gain the upper hand 上风；优势；有利地位；
Therefore athletes good at serves gain upper hand in the game.
因此发球技术较好的运动员在比赛中能够保住自己的发球局而占得先机Vw*[H!L)jGT*wydF。