In the other sentence he's been on the phone all day, we see the past participle form of be, been, he has been. So we understand the s apostrophe s is actually has there not is.
另一句he's been on the phone all day中,我们看到了be过词形式been。所以我们明白撇号s实际上是has而不是is。
Solstice derives from the Latin term solstitium, containing sol, which means " sun, " and the past participle stem of sistere, meaning " to make stand."