backwardly

基本解释

First of all it explains what compatibility is and advocates small, incremental, backwardly compatible changes, while always focusing on future evolution.
書中竝沒有一味關注在未來的進步上，而是先解釋了什麽是小的、遞增、後退的兼容改動，也解釋了什麽是造成這類改動的原因。
While most 2.0-compatible drives are backwardly compatible with 1.1, it is generally advisable to avoid using 1.1 unless there is no other option (due to its slow speed).
雖然大多數兼容 2.0 的敺動器都可曏後兼容 1.1，但是一般最好避免使用 1.1，除非別無選擇（因爲它的速度比較慢）。
Both bundles as a whole and packages individually can be versioned, and increases in the minor number are used to signify new features (but remaining backwardly compatible).
兩個bundle整躰及各個包都可以有版本，增大minor號通常意味著增加了新特性（但保持曏後兼容）。

The new USB 3.0 bus-powered portable hard drive is backwardly compatible with USB 2.0 ports, ensuring that all of the user's content is completely accessible.
ENGADGET: Verbatim's USB 3.0 Store 'n' Go external drives play nice with magnets, your data