您要查找的是不是：
- Our pilotless rocket enters the track of the earth. 我们把一个无人驾驶的火箭送入了地球的轨道里。
- The leading role is played by a complete unknown. 演主角的是一个毫无名气的演员。
- The star of the film is a previously unknown actor. 这部电影里的明星以前是个默默无闻的演员。
- This rough track will soon be a metalled road. 这条坑坑洼洼的路不久就要铺上碎石了。
- I'm trying to track down my old Aunt Maud. 我正试图寻找到我那年迈的婶婶莫德。
- Its greater part is unknown to me. 它的大部分对我是未知的。
- The cyclist went at full sail along the track. 自行车手沿着跑道全速前进。
- He was an unknown painter one year ago. 一年前，他还是一个不为人知的画家。
- Bill has a feeling he is on a fast track. 比尔感觉到他正快速迈向成功。
- The new race track is nearly six miles in extent. 这条新跑道将近六英里长。
- This is a fact hitherto unknown. 这是一个至今无人知道的事实。
- A quantity of unknown numerical value. 未知数数值不明的一个数量
- John bears the bell in all track events at school. 约翰在学校里的各个径赛项目中都赢得第一名。
- Kate is in bad with Lucy for some unknown reason. 因为某些不为人知的原因，凯特和露西关系不好。
- I'm on the track of a valuable painting. 我在追寻一幅珍贵的油画。
- We use x as the symbol for an unknown quantity. 我们用x表示一个未知数。
- Keep track of the time you actually travel. 把你旅行的实际时间记录下来。
- It is no safe wading in an unknown water. 不知水深浅，涉水不安全。
- The investigation was tabled for reasons unknown. 不知何故调查延缓进行。
- Signals control each section of the railway track. 各种信号控制着铁路轨道的每个部分。
