one final piece
definitions
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The last individual part or component required to complete a physical whole, such as a puzzle, a model, or a collection.zh: 最后一块
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The last necessary element, detail, or step required to complete a complex task, a plan, a theory, or a situation.zh: 最后的一环
examples
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I finally found one final piece of the jigsaw puzzle.
我终于找到了拼图的最后一块。
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This new evidence is the one final piece needed to solve the mystery.
这项新证据是解开这个谜团所需的最后的一环。