Stop carrying the weight of the world on your shoulders.
别太操心了,没有你地球照样转。 (carry the weight of the world on one’s shoulders:自以为重任在肩。)
I was not surprised to find that the machine still refused to work after I had reassembled it,
等我装完后,那台割草机仍然一动不动,对此我倒并不感到吃惊。