Meaning of zhèng dāng:
正当
timely; honest; reasonable; fair; sensible
Zhège juédìng shì zài yīgè zhèngdāng de shíkè zuò chū de.
这个决定是在一个正当的时刻做出的。
The decision was made at a timely moment.
Tā yǒu yī fèn zhèngdàng de gōngzuò.
他有一份正当的工作。
He has an honest job.
Tā de xíngwéi shì wánquán zhèngdàng de, yīnwèi tā shì wèile bǎohù zìjǐ.
他的行为是完全正当的，因为他是为了保护自己。
His actions were completely reasonable because he was defending himself.
Zhège juédìng shì zhèngdàng de, méiyǒu rènhé piānjiàn.
这个决定是正当的，没有任何偏见。
This decision is fair and without any prejudice.
Tā zuò chū zhège juédìng shì fēicháng zhèngdàng de.
他做出这个决定是非常正当的。
It is very sensible for him to make this decision.
just (when needed)
Tā zhènghǎo zài wǒmen zuì xūyào bāngzhù de zhèngdāng shíhòu dàodá.
他正好在我们最需要帮助的正当时候到达。
He arrived just when we needed help the most.
