open segment的用法和樣例：
例句
- He determined the length of the shortest line segment joining the two points.
他確定了連接那兩點(diǎn)的最短線(xiàn)段的長(cháng)度。 - If you place unit segments end-to-end, you will eventually get a segment larger than any given segment.
如果你將單位線(xiàn)段一個(gè)接一個(gè)連接起來(lái)，最終會(huì )得到一條線(xiàn)段，比已知線(xiàn)段都長(cháng)。
