penetrable

形容词 penetrable:

1. admitting of penetration or passage into or through
2. capable of being penetrated

pen.e.tra.ble

adj.（形容词）
Capable of being penetrated:
可渗透的，可穿透的：
例句：
penetrable defenses; a penetrable wall.
可突破的防御；可洞穿的墙

【引伸】
pen.etrabil.ity
n.（名词）
pen.etrably
adv.（副词）