🧊➡️🥛水位↗️

#glass of water #level change #density #submerge

🚶⤵️🪜

#descend #go down #downstairs #level change #lowering

🚶‍♀️🪜or🚶‍♂️🪜

#climbing stairs #step up #upward step #ascending step #stair step #level change

⛰️🌱|🧱

#retaining wall #landscape wall #garden wall #level change #soil retention #erosion control #hardscape #separator wall

⬆️⬇️/▲▼

#level change #high low