Rackwork
齿条, 齿条加工, 齿条机构
🗣️ 情景例句
Tomorrow morning after lifting weights,I'll try aerobics.
明早举完重，我去试试有氧运动。
A borrowed cloak does not keep one warm.
借来的斗篷不暖身。
He did not know from which part of Africa his ancestor had come.
他不知道祖先来自非洲的什么地方。