适用 shìyòng to be applicable
How to remember 适用: 适 suitable + 用 to use (Kangxi radical 101) = to be applicable.
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How it is used
- To be applicable to a case - 这条规定适用于所有人 (zhè tiáo guīdìng shìyòng yú suǒyǒu rén) this rule applies to everyone. Note the pattern 适用于 (applies to).
- About scope of applicability, not physical usability; 'usable/practical' is 实用 (shíyòng) or 好用 (hǎoyòng).