四个学生被派去观察不同季节的苹果。

Four students were sent to see apples in different seasons.

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学生们正在观察锡受热发生的变化。

The students are observing the behavior of tin under heat.

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学生们观察了糖在茶中的溶解。

Students observed the solution of sugar in tea.

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我们教学首重于仔细观察及修正学生的发音、重音、和语调。

Careful attention is always paid to correct pronunciation, stressing, and intonation.

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我们教学首重于仔细观察及修正学生的发音、重音、和语调。

Careful attention is always paid to correct pronunciation, stressing, and intonation.

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