1. I need to practice using the telegraph key before I can send Morse code messages.
我需要练习使用电报键，然后才能发送莫尔斯电码信息。

2. The telegraph key is an essential tool for transmitting messages over long distances.
电报键是在长距离传输信息中至关重要的工具。

3. Make sure to press the telegraph key firmly and consistently to avoid errors in transmission.
确保牢固而一致地按下电报键，以避免传输中出现错误。

4. The telegraph operator's fingers moved quickly over the telegraph key, sending out the coded message.
电报操作员的手指在电报键上迅速移动，发送出编码信息。

5. Learning how to use a telegraph key can be challenging, but with practice, you will improve your skills.
学习如何使用电报键可能是具有挑战性的，但通过练习，您将提高自己的技能。

6. The telegraph key is a simple device that revolutionized communication in the 19th century.
电报键是一个简单的设备，它在19世纪革新了通信方式。