跑步機level是什么意思

　　例句：

　　The library is all on one level.

　　圖書館全部在同一層樓上。

　　It is important not to let production levels fall.

　　重要的是別讓產量滑落。

　　Water will always find its own level.

　　水總會自行流平。

　　The conflict has now reached a new level of intensity.

　　沖突現(xiàn)在已經達到了新的激烈程度。