實驗證明，兒童在很小的時候就可以開始學習遊泳。在洛杉磯的一個特設的遊泳池裏，孩子們甚至在還沒有學會走路時就已經能熟練地在水下屏住呼吸了。兩個月的 嬰兒並未顯得不願意入水。他們很快便適應了遊泳，以致能撿起池底的物品。這些幼小的遊泳運動員非常喜愛的一種遊戲是水下三輪車比賽。三輪車並排放在7英尺 深的遊泳池底上。孩子們比賽看誰先到達遊泳池的另一端。很多孩子用腳蹬車，但多數孩子更願意推或是拉著三輪車。有些孩子能夠跑完遊泳池的全長而不用露出水 麵換氣。他們將來是否能成為奧林匹克的冠軍，這隻能由時間來作出回答。與此同時，他們對我們中的那些遊不了5碼就已喘不過氣來的人應該是種鼓舞。
兩位翻得都挺好，我的改動隻做參考。 感慨：同聲翻譯，難。
It has been proved by experiments that children are able to learn swimming at very early age. In a special swimming pool in Los Angles, infants have been able to hold breath under water before they can walk (Infancts were quite skillful in holding breath under the water before they were able to walk, 覺得用過去時更合適). The two-month infants show(showed) no sign of being unwilling in water(to get into water). They adapt(ed) to swimming so quickly that they can (could) pick up objects on the bottom of the pool. Their favorite sport is(was) a tricycle race in water. Tricycles are(were) set side by side on the bottom of swimming pool of seven feet deep. The one who first reaches(reached) the other end of the pool wins(won). Many kids pedal (pedalled) the tricycles whereas more prefer (preferred) pushing or pulling the devices. Some of them have been (were) able to cover the whole distance without lift(lifting) their head out of the water for breathing. Only (delete Only or may) may time (+can) answer if(whether) they (+can)become an Olympic champion in (+the) future or not. (In the meanwhile),They should be very encouraging for some (-some, +those)of us who become out of breath in trying to swim the first(delete the first, add shorter than)five yards.
Experiments have shown that children can start learning to swim (how about start to learn swimming) when they are very young（ok, or little?, or at the early stage). In a specially-designed swimming pool of (in) Los Angeles, children that couldn’t walk yet (unable to walk yet)held their breath under water with ease. Even two-month-old infants did not appear hesitant going into the water. They got used to swimming so fast (quickly) as to (that they could) pick up stuff (objects)from the pool bottom (the bottom of the pool). One of the young swimmers’ favorite games was (+the)underwater tricycle race. Tricycles were lined up on the 7-foot-deep swimming pool bottom (put "bottom of" in front). The children competed to be the first to reach the other end of the pool. Many children paddled with their feet on the tricycles (how about paddled tricycles with feet), but most of them liked to push or pull them. Some children could go (were able to swim) the whole(entire,full?) length without breathing out of the water. Only time can tell whether they could(can, are able to, will?) become an Olympic Champions (+ in the future) or not. In the meanwhile, it(they) should be an inspiration for (to?) those of us who can’t swim more than (delete more than) 5 yards without being out of breath.
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