“证书”是一张纸或卡片，证明你完成了学习或训练，比如毕业证书。
“Zhèngshū” shì yī zhāng zhǐ huò kǎpiàn, zhèngmíng nǐ wánchéng le xuéxí huò xùnliàn, bǐrú bìyè zhèngshū.
"Certificate" is a piece of paper or card that proves you have completed study or training, like a graduation certificate.
在学校里，表现好的同学可能会得到奖状或证书，这是对他们的表扬。
Zài xuéxiào lǐ, biǎoxiàn hǎo de tóngxué kěnéng huì dédào jiǎngzhuàng huò zhèngshū, zhè shì duì tāmen de biǎoyáng.
At school, students who perform well may receive awards or certificates, which is a praise for them.
奖状 is a certificate given for an achievement or award.
文凭 is a certificate of graduation, like a school diploma.