Aerotopography
航空摄影测图
🗣️ 情景例句
first we need to know some references.
首先我们得知道你们有哪些备询人。
A wicked book is the wickeder because it cannot repent.
一本坏书危害无穷。
a wave length (the horizontal distance between two wave crests),
波长（两个浪峰间的水平距离）