通过按住一个快捷键，玩家可以在屏幕上激活一个符号螺旋。
By pressing and holding a hot-key, a spiral of symbols is invoked on the screen.
脱氧核糖核苷酸以共价键连接起来的链。双螺旋由两条DNA链组成。
A covalently linked chain of deoxribonu- cleotides. The double helix is composed of two DNA strands.
文章详细介绍了无键螺旋桨安装的基本原理，全面分析了无键螺旋桨安装工艺的具体操作方式。
This paper presents the principle of keyless propeller fitting, and provideds in detail the technique of keyless propeller fitting operation.
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