floppy¹ disk
软盘 

例句：
Floppy disks have always been cheap to make and relatively² easy to copy.
软盘制作成本比较低，而且拷贝起来也相对容易些。
 

swim against the current (stream)
逆潮流行事；背道而驰
 
例句：
The boy who tries to succeed today without an education is swimming against the stream.
现在，没有受过教育的青年想要获得成功，其难度就好比逆水行舟。
 

I can't believe it.
我简直不敢相信。
　
对话：
A: She beat two world records.
B: That's amazing.
A: It sure is. I couldn't believe it.

A：她打破了两项世界记录。
B：那太令人惊奇了。
A：当然。我简直不敢相信。