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outstretched + noun
outstretched 作定语时直接放在名词前，表示‘张开的、伸开的’。
The child ran into her outstretched arms.
孩子跑进她张开的双臂。
伸开的；张开的；伸展的
先理解核心含义，再看它在真实句子里的用法。
伸开的；张开的；伸展的
fully extended, especially in length
The child ran into her outstretched arms.
孩子跑进她张开的双臂。
伸出的；展开的。
Extended or stretched out.
She ran toward me with her arms outstretched.
她张开双臂朝我跑来。
He stared at the outstretched hand and finally shook it.
他盯着伸出的手，最后握了上去。
The cat lay on the warm floor, its paws outstretched.
猫躺在温暖的地板上，爪子伸得直直的。
outstretched 作定语时直接放在名词前，表示‘张开的、伸开的’。
The child ran into her outstretched arms.
孩子跑进她张开的双臂。
该结构为‘with + 名词 + 形容词’，outstretched 放在名词后，强调状态。
He stood with his arms outstretched, waiting for a hug.
他双臂张开站着，等待一个拥抱。
outstretched 作表语，与 be 动词连用，描述主语的状态。
His arms were outstretched as he fell.
他摔倒时双臂张开着。
Not this
He stood with his arms outstretching.
Use this
He stood with his arms outstretched.
outstretched 是过去分词，表示“被伸开的”状态，而不是正在进行的动作；arms 在这里是“被伸开的”，所以要用 -ed 形式，不能用表示主动进行的 -ing 形式。
Not this
His arms outstretched when he hugged me.
Use this
His arms were outstretched when he hugged me.
中文可以说“他的手臂张开着”，不用动词；但英语中 outstretched 是形容词/过去分词，不能单独作谓语，必须与 be 动词连用构成系表结构，所以需要加 were。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
伸出的手
She took his outstretched hand and stepped into the boat.
她握住他伸出的手，踏上了船。
张开的双臂
The child ran into her mother's outstretched arms.
孩子跑进母亲张开的双臂中。
展开的双翼
The eagle circled above, its outstretched wings casting a shadow.
鹰在上空盘旋，展开的双翼投下阴影。
摊开的手掌
He placed the coins in her outstretched palm.
他把硬币放在她摊开的手掌上。
张开双臂（表示欢迎或拥抱）
She ran toward him with outstretched arms.
她张开双臂朝他跑去。
伸出的援手（表示帮助或和解）
He accepted the outstretched hand of his former rival.
他接受了昔日对手伸出的和解之手。
友谊之手（表示主动示好）
The country rejected the outstretched hand of friendship from its neighbor.
该国拒绝了邻国主动伸出的友谊之手。
Use outstretched naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
想象双臂向外(out)全力伸直(stretched)的样子，就是“伸开的”。
语域：neutral 常见场景：身体部位描写、文学或叙事文本 outstretched 是形容词，表示“伸开的、张开的”，多用于书面或文学描写，比如描述手臂、翅膀等伸展的状态。日常口语中也可使用，但更自然的说法常是 stretched out 等。
Genuine rhymes (stressed /e/ + /tʃt/): stretched, sketched, fetched, retched. Drenched is only a near rhyme (/e/ + /ntʃt/). Wretched looks like it should rhyme but is pronounced /ˈretʃɪd/ with two syllables.
Dictionary facts from ECDICT, WIKTIONARY.