Ring protection
[计] 环状保护
🧩 词语组成解析
ring
[riŋ]
n. 戒指，指环;铃声，钟声;环形物;拳击场;
vt. 形成环状;环绕;使（例如铃）响;打电话给;
vi. 按铃，敲钟;回响;成环形;
🗣️ 情景例句
This has been a hard course for me.
这门课对于我来说很难。
He is in difficulty in his business.
他在事业上遇到困难了。
During the day, sleep comes in snatches.
白天是忽睡忽醒，