There is no "spear" in experiment. The "e" in the second syllable should have the short (eh) sound as in error, errand. Be sure to say: ek-SPEHR ... ... <看更多>

The scientific method is the way that scientists organize and track their studies. As they learn and experiment, they use the scientific method. ... <看更多>

My first/“native” language is American English. I have had the benefit of several mentors with impeccable academic grammar and pronunciation ... ... <看更多>