While other elements within a channel may stay constant, items are likely to change frequently.

频道中的其他元素可能不变，但项经常发生变化。

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Single long molecules of DNA are then fed into a microfluidic chip, where hydrostatic pressure pulls them at a constant speed through a narrow channel.

然后单独的长的DNA分子被送入微流控芯片，静水压通过一个窄的通道以恒定的速度牵引它们。

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But constant feedback is exactly what users need. It's simply the channel of communication that needs to be different.

但持续的反馈是用户确实需要的，只是交流的渠道需要有所改变。

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With not much room for 4-minute music videos, MTV launched MTV2, a secondary channel dedicated to constant, commercial-free music videos.

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