在英语写作中，连接词如'however'和'therefore'能帮助句子更流畅。

In English writing, ___connectives like 'however' and 'therefore' help sentences flow better.

工程师检查了桥梁的金属连接件是否牢固。

The engineer checked if the metal ___connection in the bridge was secure.

这篇文章探讨了气候变化与经济危机之间的关联。

The article explores the ___connective between climate change and economic crises.