liable, apt, likely, prone, subject

形容詞 prone:

1. lying face downward
   同義詞：prostrate
2. having a tendency (to); often used in combination

1. He's prone to minor ailments.
   他動不動就生點小病。
2. He was prone to anger.
   他易于發(fā)怒。
3. The childis rather accident-prone.
   那個小孩很容易出事兒。
4. People are more prone to make mistakes when they are tired.
   人們疲勞時更容易出差錯。
5. They stepped over his prone body.
   他們從他俯臥的身體上踩過去。

prone

adj.（形容詞）
Lying with the front or face downward.
俯臥的：臉朝下躺著的
Having a tendency; inclined:
有…趨向的；傾向的：
例句：
paper that is prone to yellowing; children who are prone to mischief.
易發(fā)黃的紙；傾向于淘氣的孩子們

adv.（副詞）
In a prone manner:
仰臥地：以仰伏的樣子：
例句：
The patient was lying prone on the bed.
病人俯臥在床上

來源：
Middle English [inclined, disposed]
中古英語 [傾斜的，有傾向的]
from Latin prônus [leaning forward] * see per
源自 拉丁語 prônus [前傾] *參見 per

【引伸】
prone.ly
adv.（副詞）
prone.ness
n.（名詞）
<參考詞匯><同義詞>prone,supine,prostrate,recumbentThese adjectives mean lying down, as on the ground.
這些形容詞意為躺下來，如躺在地上。
Prone refers to lying face downward with the front of the body facing the surface on which it rests:
Prone 是指臉朝下躺著，身體的前部朝著身體下面的地面：
例句：
The spaniel lay prone on the floor, his long ears draped over his extended front legs.
那只獵獚趴在地板上，長長的耳朵耷拉在伸直的前腿上。

Supine means lying down on the back:
Supine 指仰躺著：
例句：
The victim was supine on the stretcher.
受害者仰臥在擔架上。

Prostrate denotes lying down flat or at full length:
Prostrate 指平躺著或伸直躺著：
例句：
.the prostrate trunk of a coconut tree. (Herman Melville).The word often implies that a prone or a supine position has been assumed out of humiliation, submission, helplessness, or physical or emotional incapacity:
.椰子樹的直樹干. （海默·梅爾維爾）。這個詞經常暗示被認為是屈辱、馴服、無助或身體或感情的無能的一種俯臥或仰臥姿勢：

例句：
.Heselrigge, as he lay prostrate . . . implored for life. (Jane Porter).
黑塞瑞格…當他俯臥在地時…企求饒命. （簡·彼特）。

Recumbent means lying down in a position of comfort or rest:
Recumbent 是指舒適或放松地躺著：
例句：
The picnickers were recumbent on thick moss under a big tree.
野餐的人們在大樹下厚厚的苔蘚上舒適地躺著