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ferule n.(責打學生用的)戒尺;〔比喻〕責罰;紀律。 be u...

fervency

His rod and his ferule were seldom idle now - at least among the smaller pupils 他手中的教鞭和戒尺現在很少閑著,至少對那些年較小的同學可以這么說。

Be under the ferule 在教師鞭策之下

No mere ferule will answer for this offence 你犯了這樣大的錯誤,光用戒尺不能解決問題。