basic line的用法和樣例：
例句
- The base line can be set out as a single or double chain.
基線可作為一條單鏈系或雙鏈系。 - Dr Beavan has started projects to develop long-base line tiltmeters with earthquake prediction in mind.
比花恩博士考慮到地震預報，開始發展長基線傾斜儀。 - He drew a straight line on the paper.
他在紙上畫了一條直線。 - But the bottom line seems clear.
但其底線應該是清楚的。
