若元件加一斜向直线箭头、则是可变量的符号，表示其排量和压力是可调节的。
If the part adds a diagonal straight line arrow, is the variable mark, indicated that its displacement and the pressure are may adjust.
完美屏幕抓取工具帮助你抓取整个页面或任何一个部分，可以画圆圈、标箭头、划直线以及文字注释，并且提供一键分享功能。
Awesome Screenshot lets you capture the whole page or any portion, annotate it with rectangles, circles, arrows, lines and text, blur sensitive info, one-click upload to share.
在将屏幕获取发送给聊天伙伴之前对其进行注释的新工具——现在您可以描绘直线、箭头、方块和圆形。
New tools to annotate a screen capture before sending them to a chat partner — you can now draw lines, arrows, squares, and circles.
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