1. Once in a blue moon
形容千載難逢、極少發生，像「藍月」一樣罕見。

“He only visits his hometown once in a blue moon since moving abroad.”
他移居國外後，難得回一次老家。

2. Nuts and bolts
指一些基本要素，或實用細節等。就像螺絲螺母一樣的基礎零件，引申為事物的核心組成部分。

“She’s good at big ideas but ignores the nuts and bolts.”
她擅長構想，但常忽略實際執行細節。

3. Blind someone with science
形容以專業術語去唬人，用複雜知識讓外行人困惑。

“The IT guy blinded me with science instead of fixing the problem.”
IT人員只會用術語唬我，不解決問題。

4. Run out of steam
形容精疲力盡、失去動力，像蒸汽機沒蒸汽一樣而停擺。

“The project ran out of steam due to lack of funding.”
專案因資金不足而停滯。

5. Full of hot air
比喻一些人誇大其詞、空話連篇，說話像充熱氣的熱氣球一樣空洞。

“His promises are full of hot air. He never follows through.”
他的承諾都是空話，從不兌現。