重点讲解：
1. a strand of/strands of
（头发、电线或纱线等的）股，缕；
eg. She tried to blow a gray strand of hair from her eyes.
她竭力想把眼前的一缕白发吹开。
eg. 'The fact that you can take strands of thread and basically make something out of it, that's awesome I think,' he said.
“你可以将一股股的线织成一件东西，我觉得这太棒了”，他说。
2. in contrast to
与…截然不同；与…对比鲜明；
eg. His public statements have always been in marked contrast to those of his son.
他和他儿子在公开场合的言论总是截然不同。
eg. That is in stark contrast to the situation during the 1970 oil crisis.
那和1970年石油危机时的情形完全不同。
3. how come
（用于因为惊讶而询问）怎么会这样呢，为什么；
eg. 'They don't say a single word to each other.'—'How come?'
“他们相互之间一句话都不说。”——“怎么会这样呢？”
eg. How come he hasn't been able to be as good this year?
为什么他今年表现不及往常呢？