1.
Once borrowed, it has to be returned.It's borrowed once, then returned once.One book can be an excuse for the two of them to meet twice, and it leaves no trace behind.
借了要还的，一借一还，一本书可以做两次接触的借口，而且不着痕迹。
2.
He seemed to vanish into thin air.
他不留痕迹地消失了。
3.
He need say no more to her this evening, and risk giving himself away.
今天晚上，他用不着跟她再说什么了，免得露出痕迹。
4.
These signs of a struggle foretell a violent end for the kidnapped Banker
这些争斗的痕迹预示着被绑架的行家的不祥结局。
5.
His eyes were too dry to close, so he stared fixedly at the patches on the ceiling where the roof had leaked.
眼睛干巴巴的闭不上，他呆呆的看着那有些雨漏痕迹的顶棚。
6.
A writer has found a small deposit of manganese ore and rock specimens flecked with uranium or stained green by copper.
一名作家还发现了一个不大的锰矿堆积体和一些粘染有铀痕迹或者带着铜绿斑痕的矿石标本。
7.
The tigress dragged the female bear downward for a short distance.?
树周围还有一小片带着血迹的扭打痕迹。
8.
No, nothing, not even gossamer-like traces.
我何曾留着像游丝样的痕迹呢？
9.
Have I ever left behind any gossamer traces at all?
我何曾留着象游丝样的痕迹呢？
10.
They bear traces of red ochre, a pigment.
这些外壳上有赭红色颜料着色的痕迹。
11.
These stones have obvious marks of water erosion.
这些石头有着明显的被水冲蚀的痕迹。
12.
Her sister carried with her most of the grimness of shift and toil.
她姐姐身上还带着艰辛操劳的痕迹。
13.
The detective followed the rut made by the jeep.
侦探追寻着吉普留下的车辙痕迹。
14.
Her face bore the deep imprint of suffering.
她的脸上带着受过苦难的深深的痕迹.
15.
Spreading paint over the dirty marks is no way to make a lasting improvement.
用油漆盖住那些痕迹不是长久之计。
16.
(of a record) having no marks of discredit or offense.
（指记录）没有不光彩或者犯罪的痕迹。
17.
murder without leaving a trace on the body.
在身体上不留痕迹地杀死。
18.
They disappeared without leaving a trace.
他们不见了，没有留下一点痕迹。