Rackwork
齿条, 齿条加工, 齿条机构
🗣️ 情景例句
How was your interview with Michigan?
你跟Michigan大学的人面谈得如何？
Who is the greatest poet of our times?
谁是当代最伟大的诗人？
and so the tools of long ago have remained when even the bones of the men who made them have disappeared without trace.
因此，尽管制造这些工具的人的骨头早已荡然无存，但远古时代的石头工具却保存了下来。