New Words：

audible [ˈɔːdəbl] adj.听得见的；可听的
inaudible [ɪnˈɔːdəbl] adj. 听不见的

Sample Sentences：

The shot was clearly audible in the silence.
The voice is only audible to people inside the building — those standing outside hear nothing.

His weak voice was almost inaudible.
The whistle was inaudible to the human ear.

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