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你会如何将这段javascript翻译成coffeescript？具体来说,我正在努力解决如何调用.property()函数定义.

MyApp.president = SC.Object.create({
  firstName: "Barack",
  lastName: "Obama",

  fullName: function() {
    return this.get('firstName') + ' ' + this.get('lastName');

    // Call this flag to mark the function as a property
  }.property('firstName', 'lastName')
});