这项研究强调了早期儿童教育的重要性。

The study ___underlines the importance of early childhood education.

我们必须强调博物馆在保存历史方面的价值。

We must ___underline the value of museums in preserving history.

演讲者在演示中强调了关键点。

The speaker ___underlined the key points during the presentation.