这座城市展现了多样化的建筑风格和历史影响。

The city displays the ___manifold architectural styles and historical influences.

发动机的进气歧管需要定期清洁以防止堵塞。

The ___manifold in the engine needs regular cleaning to prevent clogging.

在复印机发明前，我们得用复写纸来复制文件。

Before copiers were invented, we had to ___manually copy documents with carbon paper.