That can be worth it, but it's never a direct source of revenue.
虽然这可能是值得的，但是这却从来不是直接的收入来源。
With big stock, direct source.
货源直接，库存量大。
Personal disposable income is the direct source of saving deposit.
个人可支配收入是储蓄存款的直接来源。
Clock error is the main and direct source of errors in network measurement.
时钟误差是网络测量中最主要的直接误差来源。
Clock error is the main and direct source of errors in network measurement.
时钟误差是网络测量中最主要的直接误差来源。
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