Start with the main chain, nonane. The prefix non- indicates 9 carbons.
从主链壬烷开始。 前缀 non- 表示 9 个碳。
BBC 听力 2013年2月合集
World Cup qualifies, two Champions League games. The Argentine government has announced a temporary price freeze on all products sold in the country's main supermarket chains in an attempt to fight rising inflation.
A ridge or mountain ridge is a geological feature consisting of a chain of mountains or hills that form a continuous elevated crest for some distance. Ridges are usually termed hills or mountains as well, depending on size. There are several main types of ridges:-