汉译英，谢绝机译.

We can only memorize our childhood which was so beautiful.
Cherish the present.
Let childhood be the sweet memory.

Childhood was so happy and fine that we can only reflect it in mind now.

value highly present.

May sweet memory be childhood.

1.童年是那么美好，但现在我们只能回忆童年。
Childhood is such happy time, but now we can only recall it./We can only recall our childhood which was once so happy.
2.珍惜现在。
Cherish the present(time).
3.让童年成为美好的回忆。
make childhood the happy memory.