Person at talk of time the strength of the voice be very limited, if make in a the assembly hall which have a thousands person the each person's ability clearly hear is impossible.
人在讲话的时候声音的强度是很有限的，如果在一个有成千上万人的会场中，要使每一个人都能清楚地听到是不可能的。
Person at talk of time the strength of the voice be very limited, if make in a the assembly hall which have a thousands person the each person's ability clearly hear is impossible.
人在讲话的时候声音的强度是很有限的，如果在一个有成千上万人的会场中，要使每一个人都能清楚地听到是不可能的。
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