自什么时候起,打什么时候开始;

I came here in 1949, since when I have been engaged in this work.
我1949年到这里, 从那时起我就担任这项工作.
来源:词典精选例句We can't remember clearly since when we started to take our mobiles to dinner table.
不知何时开始,我们就开始把手机带到餐桌上了。
来源:中考真题- 2018 衡阳 短文填空BSince his parents died early, he had to earn his own living when he was a teenager.
因双亲早亡,他十几岁的时候就不得不独自谋生。
来源:《汉英大词典》Wear eye protection when opening the container, since it's so easy for contents to spurt out.
打开容器时要戴好护眼罩,因为里面的东西很容易喷出来。
来源:《柯林斯高阶英汉双解学习词典》Since when do strangers feel they can address others with such familiarity?
从什么时候开始,陌生人感觉他们可以用这样熟稔的称呼叫别人的?
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