Experiments have proved that children can be instructed in swimming at a very early age. At a special swimming pool in Los Angeles, children become expert at holding their breath under water even before they can walk. Babies of two months old do not appear to be reluctant to enter the water. It is not long before they are so accustomed to swimming that they can pick up weights from the floor of the pool. A game that is very popular with these young swimmers is the underwater tricycle race. Tricycles are lined up on the floor of the pool seven feet under water. The children compete against each other to reach the other end of the pool. Many pedal their tricycles, but most of them prefer to push or drag them. Some children can cover the whole length of the pool without coming up for breath even once. Whether they will ever become future Olympic champions, only time will tell. Meanwhile, they should encourage those among us who cannot swim five yards before they are gasping for air.
1．…children become expert at holding their breath under water even before they can walk．……孩子们甚至在还没有学会走路时就已经能熟练地在水下屏住呼吸了。
（1）expert表示“熟练者”、“专家”，后面通常跟 at／in+ doing sth．结构（cf．第59课课文详注）：
Rex soon became an expert at opening the gate.
（2）hold one's breath 为固定短语，表示“屏住呼吸”：
When the film became very exciting, Tom and Sally
would hold their breath.
Last night, when I heard a strange noise coming from the bar, I held my breath and listened carefully.
2．It is not long before they are so accustomed to swimming that they can pick up weights from the floor of the pool. 他们很快便适应了游泳，以致能捡起池底的物品。
not long before 通常译为“不久”、“很快”。 so…that 引导的是结果状语从句。 pick up 表示“捡起”。weight 在这里指比重较大（因此能沉在水底）的物品。 be accustomed to 表示“习惯的”、“适应了的”，后面通常跟名词或动名词：
My mother is accustomed to getting up early.
He soon became accustomed to his new job.
3．A game that is very popular with these young swimmers is…这些幼小的游泳运动员非常喜爱的一种游戏是……
Swimming is popular with these girls.
Mary is popular with / among children.
4．Tricycles are lined up on the floor of the pool…
line up 为短语动词，表示“（使）排成行／排队”：
Why are people lining up over ?
Line these chairs up, please.
5．Whether they will ever become future Olympic champions, only time will tell. 他们将来是否能成为奥林匹克的冠军，这只能由时间来作出回答。
What made him do it, no one knows.
How they found out the truth, only George can tell.
instruct v. 指导，传授
Los Angeles 洛杉矶
reluctant adj. 勉强的，不愿意的
weight n. 重物
underwater adj. 水下的
tricycle n. 三轮车
compete v. 比赛，对抗
yard n. 码
gasp v. 喘气
Children can be instructed in swimming at a very early age.
Dan instructs chemistry at a nearby college.
The doctor instructed Jimmy to stay in bed for a week.
I've been instructed to give you this parcel.
（1）比赛，对抗（通常与 with或 against连用）：
The children compete against each other to reach the other end of the pool.
How many people will compete in the race?
During the singing contest, Mary competed with Helen for the first prize.
Hugh's house can't compete with yours.
None of his later books can compete with his first one.
1 of 2 of…to 3 to…from
4 on…on 5 from…with 6 to…of
7 with…on 8 with…to 9 to…with
10 at…on 11 of…for 12 in / with
13 in 14 to…in…with 15 of…to
16 of 17 for 18 of…to
19 for…for 20 on…in 21 of…about
22 to 23 for/ about…at/by 24 in
25 of…of 26 to…of 27 for
28 to 29 on 30 on…of
31 to 32 to/with…of 33 to…to
34 from…of 35 in…on
1a 2b 3c 4b 5a 6d
7a 8c 9d 10a 11b 12c