Tetraethide
四乙基金属
🗣️ 情景例句
And there's so much to do.
而且这里总是有许多事可做。
Yesterday will not be called again.
光阴一去不复返。
For example, you can send information abroad immediately, but mailing a letter might take a week or so.
例如，你能够马上发送信息到国外，但寄一封信可能要大约一周的时间。