He knows his time is precious.
Meaning: This means that he understands that his time is valuable and should not be wasted.
Choice of Words: Precious is an adjective that means very valuable or important. Time is a noun that refers to a period of existence or duration. Knows is a verb that means to be aware of or understand something. Together, knows his time is precious means that he understands that his time is valuable and should not be wasted.
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