在西方文化中，眼神交流是沟通必不可少的环节。
In Western culture, maintaining eye contact in conversations is necessary.
立意与构思是美术创作必不可少的环节。
The approach and the plot are the necessary steps of the art creation.
隧道窑温度检测是陶瓷生产过程中必不可少的环节。
The temperature monitoring of tunnel kiln played a necessary role in pottery manufacturing.
应用推荐