key link

• 中心环节

key link的用法和样例：

例句

1. The classroom instruction is the teaching profession center link.
   课堂教学是教学工作的中心环节。
2. "A science fiction cannot not be regarded as a mere entertainment, but in fact it tells the reader much more."
   "科幻小说不能简单地看成是供消遣的，而实际上它给读者展示更深刻的内容。"
3. Iron and steel industry is the key link in a nation's economy.
   钢铁工业是一个国家经济的主要环节。