frail
单词辨析：
最普通用词，使用范围很广，既可指身体虚弱无力的，也可引申用于力量、意志、权力、性格等方面，表示“薄弱的”、“软弱的”等。
Her mother was weak from a long illness.
她母亲长期患病，身体很虚弱。
I'm very weak when it comes to giving up smoking.
在戒烟问题上我意志很薄弱。
The enemy became so weak that they could not go on with the war.
敌人力量变弱，无法再继续这场战争了。
语气较 weak 强，尤指身体、脉搏、声音等极为虚弱而无力的。
His pulse was too feeble to feel.
他的脉搏太弱了，摸不着。
The newborn baby gave a feeble cry.
那个新生儿哭声很弱。
Her feeble arm dropped powerless to her side.
她那虚弱的胳臂无力地垂在身边。
多指因年迈或生病而身体瘦弱的、虚弱的、衰弱的。
The old man is growing thin and frail.
那位老人日渐瘦弱。
She was still feeling a bit frail.
她仍然感觉身体有点虚弱。
Her frail hands could hardly hold a cup.
她虚弱的手几乎连杯子也拿不住。
相关例句：
That tames me in pace with its frail move.
驯服我来紧跟它脆弱的举动。
I cannot help feeling very anxious about his frail body and another operation.
他身体衰弱并需再动手术，这使我不胜悬念。
The frail wooden bridge cracked.
这座不牢固的木桥断裂了。
Not just our young and abandoned, but our old and frail.
不仅仅是我们年轻人和被遗弃的一代需要，老人和弱者也是如此。
A frail old man went to live with his son, daughter-in-law, and a four-year-old grandson.
有一位风烛残年的老人，他和儿子、儿媳还有四岁的小孙子生活在一起。
You are too frail to stand a gust of wind. I advise you to take more physical exercises.
瞧你弱不禁风的样子，我建议你多参加体育锻炼。