1. To his inherent aptitude as a guardian of flocks should be added protectiveness of the person and property of his master.
他天生就很聪明，喜欢保护羊群，继而扩展到主人和主人的财产。
2. Aptitude implies inherent capacity for learning, understanding, or performing
甚至孩童时他就显露出非同一般的数学才能。