Mid-s, at a guess. Father and son.

At a guess, I'd say she must have got lost.

据我猜测，她一定是迷路了。

At a guess I should say there were fifty people present.

我估计有50人出席。

At a guess, I should say we are speeding fifty miles and hour.

我估计我们正以每小时50英里的速度前进。

At a guess there are a hundred people here.

估计这里有100人。

At a guess, there were forty people at the party.

估计有四十人参加了聚会。

The interference between the motor vehicles flow and the non-motor vehicles flow at a grade intersection is mainly induced by crossing behavior of motor vehicles and bicycles.

平面交叉口的机动车与非机动车的干扰主要由于机动车与自行车之间的相互穿越行为引起的。

The Research Evolution of Unconventional At-Grade Intersection Design

非传统平面交叉口方案的设计研究进展

The model has three input degrees of freedom i. e. the steering-angle, the jounce of the left wheel and the jounce of the right wheel. Study on Behavior of Right-Turning Motor Crossing Through Bicycles at Grade Intersection

此模型具有转向输入角、左转向轮的跳动和右转向轮的跳动3个输入自由度，能全面地反映转向机构的运动学特性。平交口右转机动车穿越直行自行车行为研究

Study on Fuzzy Neural Network Model of the Vehicle-bicycle Conflicts at Grade Intersection Based on Failure FTA Theory

基于事故树的平面交叉口机非冲突模糊神经网络预测模型的研究

Clerk: We're at your service at any business time.

职员：营业的时间内我们都为您服务。

You can get a free map at the service counter.

你可以在服务台拿到一份免费地图。

Research on "One institute, Two systems" at Public Service Institute in China

社会公益类科研院所的一所两制问题

Of course! Remember, I'm always at your service!

当然！记得，我永远任你差遣！

We will always be at your service.

我们总将是在您的服务。

Do you think they'll be at the service tomorrow?

他们明天也会去做礼拜吗

We are at your service at all times.

不论何时，我们都准备好为您服务。

You must place your abilities at the service of the people.

你必须把你的能力用在为人民服务上。

The research on mechanism security exchange for XML data at Web Service

WEB Service中的XML数据交换的安全机制方法研究

If you need any help, I'm at your service.

你要是需要帮助，我可以随时帮忙。

We are at your service at any time.

我们为您服务在任何时候。