The three packs that I take with me on extended multi-week journeys are usually still very usable at journey's end.

这三个包，我与我借此扩展多星期的行程通常仍然在旅程结束使用。

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It can achieve single sign-on (SSO) and authorization based on attributes certificate with the composed certificate in usable field. It solves the SSO problem in the multi-certificate system.

通过对访问域内证书的合成实现单点登录和基于属性证书的授权，解决了多证书系统中的单点登录问题。

youdao

Transphorm aims to solve the multi-billion dollar problem of power waste whenever electricity from the grid is converted into usable electric power.

FORBES: Google, Soros Gamble on Power Electronics Pioneer