In fused-ring and bridged-ring compounds two carbons are common to the two rings.

在稠环和桥环化合物中，两个碳原子是两个环公用的。

youdao

In fused-ring and bridged-ring compounds two carbons are common to the two rings.

在稠环和桥环化合物中，两个碳原子是两个环公用的。

youdao