There are meant to be substitutes who can fill in for missing colleagues but this means that teaching lacks continuity-and there may not be enough stand-ins to go around.

的确有些老师可以在他们的同事旷课后代课，但这使得教学缺乏连续性——而且代课老师也不够。

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English extracurricular teaching is an important part in the school English education. It's the continuity and supplement of classroom teaching.

英语课外教学是学校英语教育中一个重要组成部分，是课堂教学的补充和延续。

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He denies that his teaching is the continuity of the ancient teachings.

他否定他的教诲是古老教诲的延续。

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"Certainly there will be continuity in the teaching of the church, " said Father Fessio, a Jesuit and former student of Benedict XVI.

WSJ: Argentina's Cardinal Bergoglio Elected Pope

"Certainly there will be continuity in the teaching of the church, " said Rev Joseph Fessio, a Jesuit and former student of Benedict XVI.

WSJ: Argentina's Cardinal Bergoglio Elected Pope

Pope Benedict argues that the Council represents continuity, not a radical revision of Church teaching for modern times.

BBC: Vatican II: Pope Benedict's unfinished business