回到山上
up the hill───上山
go up the hill───上山
run up the hill───跑上山
back to the───回到原点
the hill───小山
back up───v.支持，援助；（资料）备份；倒退；裱；堵车；vi.<篮球>协防，补防; 支持; 堵塞; 复制; 往后退
back to back───背靠背；连续，紧接；背靠背; 背对背
it s up the hill───在山上
go to hill───去山上
If you can't go up the hill forwards, you'll have to back up.───如果你不能往前爬上山，那你就得向后退。
In the past decade, scientists have figured out how to push differentiated cells back up the hill and, perhaps even more surprising, directly from one valley to the next.───在过去的几十年里，科学家研究发现了将已分化的细胞推回山顶的方法，更令人惊奇的是，甚至有可能将细胞直接推入另一条峡谷。
For those of you who may not remember, Sisyphus, of Greek mythology, was the guy condemned to push a boulder up a hill, watch it roll back down, and repeat this for all eternity.───有些人可能不记得希腊神话里西西弗这个人了。他将一块巨石推上山顶，看着它从山顶滚下来，然后一生重复做这件事。
Then he turned and began to push the bicycle back up to the hill.───继而他又转头，并开始推自行车返回到山。