单通道控制单元可升级为二或四通道控制单元。
The one channel control unit can be upgraded to 2- channel or 4- channel control unit.
他还补充道：“最近，商业信心也受到了逐步升级的国债危机严重影响。”
"More recently," he added, "it's possible that business confidence also took a blow because of the escalating sovereign debt crisis."
但他们“后来不太愿意升级到6s，因为后者只有很小的改变，”他补充道。
They "were less inclined to upgrade to a 6s, which only had very minor changes," he added.
但他们“后来不太愿意升级到6s，因为后者只有很小的改变，”他补充道。
They "were less inclined to upgrade to a 6s, which only had very minor changes," he added.
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