Nelsonite
钛铁磷灰岩
🗣️ 情景例句
It's certainly a good idea.
这的确是个好主意。
Let's hope for the best.
让我们往好处想吧。
while our own compulsory school attendance became law in Germany in 1642,
而我们的义务教育成为法律在德国是在1642年，