重点讲解：
1. keep up with （与…）齐步前进；不落后（于…）；
She shook her head and started to walk on. He kept up with her.
她摇了摇头开始往前走Y&Z!;eUO[y。他跟了上去w8)8OSfscvz~i9c。
2. separte from 隔开；阻隔；使分开；
They became separated from their party.
他们和伙伴们分开了;cK3[x!Su|s。
3. be suited to 合适的；适宜的；适当的；
The area is well suited to road cycling as well as off-road riding.
这个地方很适合举行自行车公路赛和越野赛*!Cj)rqD.F&c[l_0u5jr。
4. compared to 与…相比；和…比起来；
His progress at school had been unspectacular compared to his brother.
和弟弟相比，他在学校里的进步很不起眼#u8hcZL99K|[。