医生强调,长期卧床的病人必须定期活动四肢,以免肌肉萎缩。Yīshēng qiángdiào, chángqī wòchuáng de bìngrén bìxū dìngqī huódòng sìzhī, yǐmiǎn jīròu wěisuō.The doctor stressed that patients who stay in bed for long periods must move their limbs regularly to prevent muscle atrophy.
他每天坚持锻炼四肢,身体越来越好。Tā měitiān jiānchí duànliàn sìzhī, shēntǐ yuèláiyuè hǎo.He exercises his arms and legs every day, and his health keeps getting better.
孩子游泳时四肢协调,教练夸他学得快。Háizi yóuyǒng shí sìzhī xiétiáo, jiàoliàn kuā tā xué de kuài.The child moves all four limbs in coordination while swimming, and the coach praises him for learning quickly.