everlasting

adjective [原级]永恒的；接连不断的

That is how I found myself on the road with four kids, a baby lamb and nothing but my everlasting optimism to see me through.
就这样，我上路了。带着四个孩子和一只小羊羔，以及支撑我走下去的永恒不变的乐观主义精神。