Rackwork
齿条, 齿条加工, 齿条机构
🗣️ 情景例句
I've been trying to find
我一直在寻求
I suppose it might be gold.
说不定是金子啊。
I nearly forgot! It's Grandma's birthday next Thursday
我差点儿忘啦！下星期四是奶奶的生日。