孩子们在沙滩上堆沙子,乐此不疲。Háizimen zài shātān shang duī shāzi, lècǐ bùpí.The children piled up sand on the beach and never got tired of it.
他喜欢收集旧邮票,几十年来乐此不疲。Tā xǐhuan shōují jiù yóupiào, jǐshí nián lái lècǐ bùpí.He loves collecting old stamps and has never tired of it in decades.
小狗追着球跑来跑去,一玩就是半天,乐此不疲。Xiǎo gǒu zhuī zhe qiú pǎo lái pǎo qù, yì wán jiùshì bàntiān, lècǐ bùpí.The puppy chased the ball back and forth, playing for hours without getting tired of it.