（1）USA代表美利坚合国.（stand for）
USA stands for the United Nations.
（2）我们把这条狗看成了我们家的一员.（consider...as...）
We consider the dog as a member in my family.
（3）妈妈在做饭的时候,儿子在玩电脑.（while）
While the mother was cooking, her son was playing computer games.
（4）我一到那里就会给你写信.（as soon as）
I will write to you as soon as I arrive there.
（5）我长大了想当一名宇航员.（grow up）
I want to be an astronaut when I grow up.
（6）我花了一个小时时间算出这道数学题.（spend,work out）
I spent an hour (in) working out the maths problem.如果还有其他疑问,可以去“状元365”提问.