keep on是什么意思

The ECB also pledged to keep on supporting the markets.

欧洲央行还承诺继续支持市场。

And they will keep on visiting it and linking to it.

而且他们会一直访问并链接它。

But for lunar scientists, they're gifts that keep on giving.

但对月球科学家而言，此次登月一直不断地带给他们新的研究成果。