plunk + down/in/on/into + noun phrase
plunk 作为副词时，常与表示位置的介词连用，强调动作发出的扑通声。
He plunked the book down on the table.
他把书扑通一声放在桌子上。
咚地一声；发出扑通声；恰好
咚地一声
with a short hollow thud
The heavy book dropped plunk onto the wooden floor.
沉重的书扑通一声掉在木地板上。
用法提示：表示发出扑通声
The ball landed plunk in the center of the target.
球恰好落在靶心。
用法提示：表示恰好
His answer was plunk on the mark.
他的答案恰好正确。
用法提示：表示恰好
plunk 作为副词时，常与表示位置的介词连用，强调动作发出的扑通声。
He plunked the book down on the table.
他把书扑通一声放在桌子上。
此用法表示“恰好，正好”，常用于强调位置精准。
The stone landed plunk in the middle of the pond.
石头恰好落在池塘中央。
plump 作副词时指沉重地落下（常指人），与 plunk 的“发出扑通声”相似，但 plunk 更常用于物体或表示恰好
发音与 plunk 相近，但意义完全不同，指考试失败
拼写相似，但发音不同（plank /plæŋk/ vs plunk /plʌŋk/），意义无关
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