Photostratigraphy
摄影地层法
🗣️ 情景例句
For example, did you know that 1 in 4 teenagers has tried marijuana?
比如，你是否知道4个青少年中就有1位曾经吸过大麻？
That's rather disappointing.
真是让人失望。
You're a pain in the ass.
你这讨厌鬼。