[Script Info]
Title: 
[Events]
Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,Hello, friends!
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,We learned that the ray is a line segment
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,wjth a beginning point\Nto an endless point.
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,So it extends from one direction only.
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,But what happens if the line segment\Nextends from two directions?
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,If the line segment extends\Nfrom two directions
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,to an endless point\Nand we can't measure its length,
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,it's called a straight line.
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,And a straight line like, this, AB or BY
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,and a small line with two arrows above it.
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,My friends, I hope you learned\Nthe difference
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,between the line segment, the ray,\Nand the straight line.