Ball and roller bearing
[化] 滚珠-滚柱轴承
🧩 词语组成解析
ball
[bɔl]
n. 球;棒球（投手投出的）坏球;拇指球;舞会;
vt. 做成球状，使成团块;（指男性）和（女性）交媾（美式英语）;
vi. 呈球形，成团块;[美国俚语、口语]狂欢作乐，消遣;尽情作乐，尽情地玩;
and
[ənd, ən,ænd]
conj. 和，与;而且;于是，然后;因此;
🗣️ 情景例句
Shows marked dislike for schoolwork.
明显讨厌功课。
That was a close call.
太危险了。
Knowledge began to increase as soon as the thoughts of one individual could be communicated to another by means of speech.
人一旦能用语言同别人交流思想，知识的积累便开始了。