Cacti are unique to American deserts. 仙人掌是美国沙漠中独一无二的植物

56. The rain may be long gone...
    雨季也许早已过去
57. ...but there is water here...
    但沙漠里还是有水
58. ...locked away within the tissues of specialist desert plants.
    只是储存在沙生植物特化的组织当中
59. Cacti are unique to American deserts.
    仙人掌是美国沙漠中独一无二的植物
60. They all hoard water,
    它们肥硕的茎干
61. storing it in swollen stems
    有储水功能
62. and protecting it behind a barricade of spines.
    叶片特化成刺以防止水分散失

来自《行星地球 第二季 第四集 Planet Earth S02E04 沙漠》第 59 行