Xu M. -z., Luo L. -s., Li Y., Wu Y. -q., Jiang X. -h., Xu J. -s. Intravascular ultrasound versus coronary angiography in coronary artery stent implantation.

许美珍，罗来树，李颐，吴延庆，姜醒华，徐劲松血管内超声与冠状动脉造影在冠状动脉支架置入中的应用比较。

youdao

So it's OK to not specify. I want to point out, pz whether you're in the p x, the p y, or the p z, unless a question specifically m asks you to specify the m sub l, which occasionally will happen, but if it doesn't happen you just write it like this.

我想指出的是，无论你在px，py或，除非一个问题特别地,让你指出l下面的，这种情况有时会发生，这样就可以了,但是如果它不做要求你们写成。

麻省理工公开课 - 化学原理课程节选

If I'm told 'don't play X, Y, Z', they won't play.

BBC: Police to question Pakistan bowler Wahab Riaz next week