“珍爱每一个母亲和儿童”活动将在世界卫生日启动，它与报告拥有相同的主要主题。

Make every mother and child count is being launched on World Health Day, which shares the report's main theme.

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本文讨论了两个主要主题。

This article has discussed two major topics.

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基因学的一个主要主题就是比较dna序列并尝试找出两个序列的公共部分。

A major theme of genomics is comparing DNA sequences and trying to align the common parts of two sequences.

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