const bytesAvailable = totalBytes - offset;
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，更多细节参见新收录的资料
This 1TB of space lets you secure 250,000 12MP photos, 500 hours of HD video, or 6.5 million PDF files for good. If you’re already using another service, you can easily connect an existing account and transfer your files over from Dropbox, Google Drive, Amazon, OneDrive, and more.
输出：[4,2,4,-1,4]（最后一个 3 绕一圈找到 4）
The dictionary feature helps users understand the meanings of words.