Mastoidotomy
乳突凿开术
🗣️ 情景例句
(a foreigner) Is that a special day?
（一个外国人）是一个特殊的日子吗？
A little labour,much health.
适量的劳动大有益于健康。
knowing that others will carry on what I can no longer do,
明白了有人会继续我的未竟事业，