原子核由带____ 电的质子和不带电的____ 组成．
Which do you prefer to use to keep in touch with your friends, QQ WeChat?
二次函数y=5（x﹣4）2+3向左平移二个单位长度，再向下平移一个单位长度，得到的函数解析式是____．
China is changing.
