开心 kāi xīn to feel happyto rejoiceto have a great timeto make fun of sb Example sentences 可以跟你一起逛街,真开心! kěyǐ gēn nǐ yīqǐ guàngjiē, zhēn kāixīn! It is happy to go shopping with you 大家都开心地去旅行了。 dàjiā dōu kāixīn de qù lǚxíng le. Everyone was happy to travel 拿到礼物以后,他笑得真开心。 nádào lǐwù yǐhòu, tā xiào de zhēn kāixīn. After receiving the gift, he smiled happily 今天是他的生日,但是为什么他看起来不太开心? jīntiān shì tā de shēngrì, dànshì wèishénme tā kàn qǐlai bù tài kāixīn? Today is his birthday, so why does he seem unhappy?