重點講解：
1. line up
（使）（某一批人）排成行；（使）列隊；
eg. The senior leaders lined up behind him in orderly rows.
高級將領整齊有序地在他身后站成幾排。
eg. The gym teachers lined us up against the cement walls.
體育老師讓我們靠著水泥墻排好。
2. show up
如約趕到；出現；露面；
eg. He always shows up in a fancy car.
他總是乘坐一輛奢華轎車露面。
eg. If I don't show up for class this morning, I'll be kicked out.
如果我今天上午不去上課，我就要被開除了。
3. make a contribution to
對……做出貢獻；
eg. American economists have made important contributions to the field of financial and corporate economics...
美國的經濟學家們在金融和企業經濟學領域做出了重要的貢獻。
eg. We must make a contribution to protecting the environment.
我們必須為保護環境作出貢獻。