You may have some strange disease that may not show up for 10 or 15 years.
你可能患有某种10年或者15年都看不出什么症状来的怪病。
2.a number of 许多
There are a number of improvements; for instance, both mouse buttons can now be used
在许多地方有了改进，例如，鼠标的左右键都可以使用了。
3.pat on 拍打
Don't you worry about any of this, she said patting me on the knee.
这个你什么都不用担心，她轻拍着我的膝盖说。
4.crawl on 爬行
I began to crawl on my hands and knees towards the door
我开始手脚并用朝门口爬去。
5.finish line 终点线
Elliott crossed the finish line just half a second behind his adversary
埃利奥特跨过终点线时仅比对手落后半秒钟。
