then I moved to Chekhov, then stage combat, commercials class, voice overs,

然后我学习契诃夫的作品，然后是舞台动作表演、商业课和旁白。

纽约的人们 - SpeakingMax英语口语达人

However, because some character classes or skill sets can easily defeat characters of other classes or skills in many MMORPGs, developers should consider a skill-point character development system over a class-based system to balance play and to provide an opportunity for any character class engaged in combat to win.

FORBES: Studying Player Commitment To MMORPGs

The Navy built two classes of warships around the Aegis combat system, beginning with the Ticonderoga class of cruisers in the 1980s and then the Arleigh Burke class of destroyers in the 1990s.

FORBES: Missile Defense Becomes A Navy Mission

Thus, delaying carrier construction would allow some near-term cost avoidance, but over the longer term the service would end up paying more for each carrier and other combat systems such as the Virginia-class attack submarine.

FORBES: Despite Budget Woes, The Navy Is Unlikely To Cut Carriers