retaining wall

US /rɪˈtenɪŋ/

UK /rɪˈteɪnɪŋ/

A1 初級
n.名詞擋土牆
The retaining wall prevents the soil from eroding.

影片字幕

祕魯馬丘比丘|印加失落之城 (Machu Picchu, Peru | The Lost City of the Inca)

12:01祕魯馬丘比丘|印加失落之城 (Machu Picchu, Peru |  The Lost City of the Inca)