They've been a great advance in portable power storage.

在便携式电能存储方面这枚小电池无疑是巨大的飞跃。

It was most commonly used for portable storage, and became near ubiquitous from the mid 1970s up to the mid 90s.

它最常用于便携式存储，从 20 世纪 70 年代中期到 90 年代中期几乎无处不在。

With the development of digital technology, sound and video can now be stored on a PC, on the Internet, or using some form of portable storage.

随着数字技术的发展，声音和影像被储存在个人电脑里，在网上，或者使用一些便携存储形式。