Train arm
[机] 轮系臂
🧩 词语组成解析
arm
[ɑrm]
n. 臂;武器;[复数]战事;权力;
vi. 准备（斗争），准备行动（against）;
vt. 装备（防御工事）;准备（攻击或迎击）;配备;防护;
🗣️ 情景例句
When you have a business meeting in the United States, come to the appointment on time.
当你在美国有商务会晤时，一定要按时赴约。
That's a tough question to answer.
那是一个很难回答的问题。
Who's not here?
谁还没有到？