你不可能听到门铃声——门铃电池上周就坏了。

你不可能听到门铃声——门铃电池上周就坏了。

You couldn't have heard the doorbell — the battery has been dead since last week.

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You couldn't have heard the doorbell — the battery has been dead since last week.

couldn't have heard 表示对过去感知的否定推测——门铃电池损坏是听不到声响的直接证据。

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