Photoperiod(ism)
[化] 光周期性
🗣️ 情景例句
What time is it, anyway?
几点钟了， 顺便说一声。
How do you do.
你好。
She's been there for two months. She's been there since September.
她进校有两个月了。她自9月份起便在那儿学习了。