雨兰共舞
The number of animals used for scientific experiment had been greatly reduced during the last two decades.( last score of years, last twenty years.)
幽深的猫巷
1.have be greatly decreased 2.As we can see, the way students spend their holiday has changed a lot.
shchengzhang
In the past twenty years, the number of animals used in scientific experiments greatly reduced
小璇璇APPLE
我觉得可以这样翻译，There are many transportations to help us to save time,such as airplanes, and high speed railways.另外说一下动车属于高速铁路的一种，在国外没有动车这种说法同一脚high speed railway或者high speed train 希望能帮到你！
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