In this task, we ask you to rewrite a sentence in simple English without changing its general meaning. Essentially, you want to make the sentence easier to read by using simpler words, utilizing more straightforward sentence structures, and omitting non-essential information etc.

On this city , the university provides four " Maste ̀ res Spe ́ cialise ́ s " courses at the Civil Aviation University of China only for Chinese students : airport management , aviation safety management – airworthiness , aviation safety management – flight ope ́ rations ( in partnership with the " Institut Supe ́ rieur de l 'Ae ́ ronautique et de l 'Espace " ) and aviation safety management – aeronautical maintenance ( in partnership with the " Institut Supe ́ rieur de l 'Ae ́ ronautique et de l 'Espace " ) .
On this city , the university has four " Maste ̀ res Spe ́ cialise ́ s " courses at the Civil Aviation University of China only for Chinese students : airport management , aviation safety management - airworthiness , aviation safety management - flight operations and aviation safety management - aeronautical maintenance .

International direct dialing ( IDD ) or international subscriber dialling ( ISD ) is placing an international telephone call that is dialed directly by a telephone subscriber , rather than by a telephone operator .
International Direct Dialing ( IDD ) is an international telephone call dialed by the caller rather than going via an operator .

More importantly , the discovery of celestial bodies orbiting something other than Earth dealt a blow to the then-accepted Ptolemaic world system , which held that Earth was at the center of the universe and all other celestial bodies revolved around it .

More importantly , the discovery of celestial bodies orbiting something other than the Earth dealt a blow to the then-accepted Ptolemaic world system .

