1 to introduce (sb to sb)

2 to give a presentation

3 to present (sb for a job etc)

4 introduction

1 surname Chang

1 regular

2 normal

3 ordinary

1 frequently

2 constantly

3 regularly

4 often

5 day-to-day

6 everyday

7 daily

1 very

2 very much

3 unusual

4 extraordinary

1 complete change from the normal state (idiom); quite uncharacteristic

2 entirely outside the norm

3 out of character

1 three principles and five virtues (idiom)

2 the three rules (ruler guides subject, father guides son and husband guides wife) and five constant virtues of Confucianism (benevolence 仁, righteousness 義|义, propriety 禮|礼, wisdom 智 and fidelity 信)

1 human nature (idiom)

2 a behavior that is only natural

1 to be on the horns of a dilemma (idiom)

1 commonplace in military operations (idiom)