data is actually passed by reference, avoiding expensive copies.
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Италия — Серия А|28-й тур，推荐阅读新收录的资料获取更多信息
for i in 1..20 {
，这一点在新收录的资料中也有详细论述
Explosion reported outside US embassy in Oslo, police say
println(doubled); // [2, 4, 6, 8, 10]，推荐阅读新收录的资料获取更多信息