The latter is to reflect the fact that even during times when no data are being transferred, the bandwidth is unavailable to other potential users. 后者将反映事实，甚至在时代期间，当没有数据正在被转移的时候，带宽对其他的潜在使用者是得不到的。
unavailable英英释义
Adjective:
not available or accessible or at hand;
"fresh milk was unavailable during the emergency" "his secretary said he was unavailable for comment"
