(2) exchange A for B 即 “用A來換B”。例：exchange dollars for RMB（美元換人民幣）; exchanging labor for room and board（用勞動來換取食宿）; exchange a position in the private sector for a post in government（用私營部門的職位換取政府機構的崗位）。
2. 名詞。基本用法：
(1) “交換，互換”。例：There have been numerous exchanges of views between the two governments（兩國政府間曾多次交換意見。）.
(2) “兌換，匯率”。例：The purpose was to halt the rise in the exchange rate of the Swiss franc（目的在於制止瑞士法郎匯率上漲。）.
exchange的用法：
首先，應掌握它的三個詞性：動詞，名詞，形容詞。
分別來說一下它們的用法。
1. 動詞。基本用法：
(1) exchange sth 即“交換某物”。例：exchange gifts（交換禮物）; exchange ideas（交換想法）
(2) exchange A for B 即 “用A來換B”。例：exchange dollars for RMB（美元換人民幣）; exchanging labor for room and board（用勞動來換取食宿）; exchange a position in the private sector for a post in government（用私營部門的職位換取政府機構的崗位）。
2. 名詞。基本用法：
(1) “交換，互換”。例：There have been numerous exchanges of views between the two governments（兩國政府間曾多次交換意見。）.
(2) “兌換，匯率”。例：The purpose was to halt the rise in the exchange rate of the Swiss franc（目的在於制止瑞士法郎匯率上漲。）.
3. 形容詞。基本用法：
“交換的，交流的”。例：an exchange student（交換生）; exchange programs （交流專案）
所以不是exchange的後面一定要加for，要看你是否有交換的目的，因些那兩句中並不需要for。
Any beautiful backpack can"t even exchange my little bag.
The most beautiful bag also can"t exchange my satchel.