Definition: relating to people or their characteristics Level: B1
锻炼对（人类的）身体至关重要。
Exercise is essential for the ___human body.
这场事故是（人为）失误造成的。
The accident was a result of ___human error.
这部纪录片探讨了（人类）大脑的惊人能力。
The documentary explored the incredible abilities of the ___human brain.
