permanently open meaning in English

日夜开放

2 fixed , permanently open horizontal slot shall be provided 17 inches above the work surface
排气槽水平方向离工作台面要有17英寸的距离。
One can easily imagine a japanese surfer keeping the oed window permanently open to help him navigate an alien language
很容易想象，某个日本冲浪者得一直开着《牛津英语词典》的窗口才能在这门"外语"里航行。
It may be a modified stoma with the guard cells permanently open so that water is lost passively by hydrostatic pressure , as in sea lavenders ( limonium ) , or a glandular hair from which water is actively secreted , as in runner bean ( phaseolus )
这可能是由于气孔的保卫细胞永久张开而使水分在静水力的作用下被动排出，比如海薰衣草（补血草属）；也可能是由腺毛主动分泌水分到外部，比如红花菜豆（菜豆数）。