keep up（与…）齐步前进；不落后（于…）；跟上（变化等）；跟上（活儿、人等）；同…做（或理解）得一样好；了解；熟悉
Slow down ─ I can\'t keep up!
慢点——我跟不上了！
When she lost all her money, she was determined to keep up appearances.
她把钱全亏光时，决意佯装若无其事。
The little\' uns couldn\'t keep up.
小不点儿跟不上了。
水利万物而不争,
而万物莫能与之争。
