voluntary
Definition
Done, given, or acting of one's own free will, without being compelled.
中文 凭自己的意愿做出、给予或行动的，不被迫的。
Example
"He made a voluntary donation to the charity."
Done, given, or acting of one's own free will, without being compelled.
中文 凭自己的意愿做出、给予或行动的，不被迫的。
"He made a voluntary donation to the charity."