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peck at sth
peck at sth 强调用喙反复、试探性地啄；若要说明啄的结果（如啄出一个洞），则用及物结构 peck sth（into sth）。
The hen pecked at the grain scattered on the ground.
母鸡啄食撒在地上的谷粒。
啄；啄击
先理解核心含义，再看它在真实句子里的用法。
啄；啄击
To strike or poke with the beak, as a bird does.
The hen pecked at the grain scattered on the ground.
母鸡啄食撒在地上的谷粒。
用鸟喙啄击或啄穿
To strike or pierce with the beak or bill (of a bird).
向前踉跄；尤指马以蹄尖着地而绊倒
To lurch forward; especially, of a horse, to stumble after hitting the ground with the toe instead of the flat of the foot.
用喙或尖物啄成
To form by striking with the beak or a pointed instrument.
用尖物反复快速击打、戳、刺或挖
To strike, pick, thrust against, or dig into, with a pointed instrument, especially with repeated quick movements.
peck
Base
原形
pecks
3rd person
第三人称单数
pecking
-ing
现在分词
pecked
Past
过去式
pecked
Past participle
过去分词
The bird pecks at the tree.
鸟啄树。
She pecked her food slowly.
她慢慢地啄食。
He has pecked a hole in the wall.
他在墙上啄了一个洞。
The chicken pecked at the grain scattered on the ground.
那只鸡啄食着撒在地上的谷粒。
She pecked at her dinner without much appetite.
她没什么胃口，只勉强吃了点晚餐。
The woodpecker pecked a hole in the tree trunk.
啄木鸟在树干上啄出了一个洞。
peck at sth 强调用喙反复、试探性地啄；若要说明啄的结果（如啄出一个洞），则用及物结构 peck sth（into sth）。
The hen pecked at the grain scattered on the ground.
母鸡啄食撒在地上的谷粒。
这里 into 引出啄成的结果或位置，宾语可指被啄的对象，也可指啄出的东西，如 a hole。
The woodpecker pecked a hole into the tree trunk.
啄木鸟在树干上啄出一个洞。
Not this
She pecked her lunch, not feeling hungry.
Use this
She pecked at her lunch, not feeling hungry.
当 peck 表示“小口吃、没胃口地吃”时，是不及物动词，必须与介词 at 搭配，即 peck at something；直接用 peck something 意思是“用喙啄某物”，不能用来表达人进食。
Not this
He pecked on her cheek.
Use this
He pecked her on the cheek.
peck 在表示“轻吻”时是及物动词，宾语必须是人，如 peck somebody；“吻的部位”由介词 on 引出，即 peck somebody on the cheek。若写成 peck on her cheek，动词缺少宾语，不符合该动词的用法。