“用普通话怎么说”是in Mandarin, m 需要大写，就和别的语言首字母要大写一个道理。
in mandarin。用介词in没错的。要看放哪，放句首就要大写
This (this sentence) how to say with Mandarin我保证没错轿脊。。。。。念帆姿。。。。仔绝
How to speak this in Mandarin？
