var e2c = { dog:"狗", cat:"貓", a: "一隻", chase:"追", eat:"吃" };

function mt(e) {
  var c = [];
  for (i in e) {
    var eword = e[i];
    var cword = e2c[eword];
    c.push(cword);
  }
  return c;
}

var c = mt(process.argv.slice(2)); 
console.log(c);