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1·He took three steps backwardly.

他倒退了三步。

2·Can you say the alphabet backwardly?

你能倒著念字母表吗？

3·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).

虽然大多数兼容2.0的驱动器都可向后兼容1.1，但是一般最好避免使用1.1，除非别无选择(因为它的速度比较慢)。

4·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).

两个bundle整体及各个包都可以有版本，增大minor号通常意味着增加了新特性(但保持向后兼容)。