approach motive的用法和樣例：
例句
- Earlier in this section, we noted that the tails of the normal distribution approach but never touch the horizontal axis.
本節前面已經指示，正態分佈的兩個尾端趨近於橫軸，但永遠不與橫軸相交。 - What is specific to black holes, however, is that the redshift becomes infinite as the travelers approach the horizon.
不過黑洞特殊的地方在於，隨著旅人向視界趨近，紅移會變成無限大。
