这两位作者合作撰写了一系列儿童书籍。

The two authors ___collaborated on a series of children's books.

研究团队与来自多个国家的专家进行了合作。

The research team ___collaborated with experts from multiple countries.

为解决复杂的全球性问题，科学家们必须跨学科、跨国界进行合作。

To solve complex global issues, scientists must ___collaborate across disciplines and borders.