Simply draw a line with or without an arrow linking one thought to another.
轻松地画一条有箭头或没箭头的线把一个想法和另一个关联起来。
Click down arrow again to advance past line 11.
再次单击向下箭头，执行第11行。
"World line" represents the model of the universe arrow.
“世界线”代表了宇宙箭头的模型。
The RIGHT ARROW key: Scrolls content one line to the right.
向右键：将内容向右滚动一行。
The left ARROW key: Scrolls content one line to the left.
向左键：将内容向左滚动一行。
The left ARROW key: Scrolls content one line to the left.
向左键：将内容向左滚动一行。
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