His son Tony came back from the car holding a heavy tool.

他的儿子托尼从车里回来，拿着一个很重的工具。

Barrels are often found on farms. They are usually strong and good for holding tools.

农场里经常会有这种圆桶。它们通常很坚固且很适用于夹持工具。

So you need robots to facilitate their experiments, assisting them with the communications and just docking onto surfaces to be their third arm holding different tools.

因此，您需要机器人来促进他们的实验，协助他们进行交流， 并只是停靠在表面上， 成为他们手持不同工具的第三只手臂。

We are looking at different technologies, we found that there was a need to help industrial workers who are experiencing fatigue from holding heavy tools out for long periods of time.

我们在考量各种截然不同的技术, 我们发现有必要帮助那些很长一段时间内举起沉重物体感受疲劳的工人。