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因此在第二秒内，速度没变。
So during the second second, the velocity is not changing.
youdao
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在第二秒，从+3移动到，又移动了6米。
Then in the second second -3 it goes from plus three to minus three so it travels another six meters.
youdao
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录制音频的第一第二秒可能非常响亮。
First second of recorded audio may be very loud.
youdao
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录制音频的第一第二秒可能非常响亮。
First second of recorded audio may be very loud.
youdao