changeable
adj
1 tending to change; often changing 易变的; 常变的
a changeable person, mood 喜怒无常的人、 情绪
changeable weather 多变的天气.
2 that can be changed 能被改变的.
I must say the products in Shanghai have improved very much in the past ten years.
我得承认上海的产品这十年来进步了很多。
It's out of the question.
这是不可能的。
Alternatively, if the star were small, the life-supporting planet would have to have a close orbit round it and also provide the perfect conditions for life forms to develop.