母狼的幼仔丢失后会将人的婴孩哺育成狼孩,这个事实说明( )
_______ means relating to the present time, for example the present decade or present century.
用玻璃管向盛有紫色石蕊试液的试管里吹气,过一会儿再给试管加热,试管里溶液颜色变化情况是( )