Ratch
n. （防倒转的）棘齿
✅ 同义词
🗣️ 情景例句
It was an extremely difficult and dangerous task.
这是一项极度困难的危险的工作。
Can you imagine what it would be like to live without electricity?
你能想象出生活中没有电会是怎么样的一种情形吗？
It is also useful for sending pictures, designs, maps and so on.
传真机也可以用来发送图片、地图等。