at a very early age 在很小的年纪
be accustomed to do 适应做
be lined up 并排放
be popular with 受……的欢迎
be reluctant to 不愿意做
become expert at 在……方面成为能手
compete 比赛,对抗
compete against 与……竞争,与……抗衡
cover the whole length of 跑完……的全长
gasp 喘气
gasp for 喘气
hold one's breath 屏住呼吸
Los Angeles 洛杉矶
reluctant 勉强的,不愿意的
tricycle 三轮车
underwater 水下的
weight 重物
yard 码