忽...忽... shows rapid alternation.
Alternating states
Fixed pattern
See examples below for varied real-world usage.
Rapid alternation
- ✅ 忽冷忽熱。
- ❌ 忽熱冷。
Two adjectives
- ✅ 忽明忽暗。
- ❌ 忽明。
His mood has been up and down recently.
The internet signal is strong then weak.
The wind is alternating between strong and weak, not stable.
She speaks fast then slow, and I cannot quite follow.
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