1
carry a pocketknife
复数形式为 pocketknives。
He always carries a pocketknife when he goes camping.
他去露营时总是随身带着一把小折刀。
折刀；小折刀；随身小刀
pocketknives — plural of pocketknife
先理解核心含义，再看它在真实句子里的用法。
折刀；小折刀；随身小刀
a knife with a blade that folds into the handle, suitable for carrying in the pocket
He always carries a pocketknife when he goes camping.
他去露营时总是随身带着一把小折刀。
小到可安全方便放入口袋的刀；通常为折叠刀(刀片或工具可折叠收入手柄)。
A knife small enough for carrying safely and handily in a pocket; usually a folding knife (with blades or tools that the user can fold or retract into the handle).
He always keeps a pocketknife in his backpack for camping trips.
他总是在背包里放一把随身小折刀，供露营旅行使用。
She used her pocketknife to open the cardboard box.
她用随身小折刀打开了纸箱。
My grandfather gave me a pocketknife with a wooden handle.
我祖父送给我一把木柄随身小折刀。
复数形式为 pocketknives。
He always carries a pocketknife when he goes camping.
他去露营时总是随身带着一把小折刀。
She opened her pocketknife to cut the string.
她打开小折刀把绳子割断。
They used a pocketknife to open the package.
他们用小折刀打开包裹。
Not this
He bought two pocketknifes.
Use this
He bought two pocketknives.
pocketknife 的复数不是直接加 -s，而是以 -fe 结尾，需把 f 变为 v 再加 -es，所以是 pocketknives。
Not this
He always carries pocketknife in his bag.
Use this
He always carries a pocketknife in his bag.
pocketknife 是单数可数名词，英语中单数可数名词前通常需要 a/the 等限定词；中文没有冠词，因此容易漏掉 a。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
打开小折刀
He opened his pocketknife to cut the rope.
他打开小折刀割绳子。
合上小折刀
Make sure to close the pocketknife after you finish.
用完以后一定要把小折刀合上。
随身携带小折刀
Many hikers carry a pocketknife for emergencies.
很多徒步旅行者会随身携带小折刀以防万一。
磨快小折刀
You should sharpen your pocketknife before the trip.
出发前你应该把小折刀磨快。
掏出小折刀
He pulled out a pocketknife and started cutting branches.
他掏出一把小折刀，开始砍树枝。
小折刀的刀片
The pocketknife blade is small but very sharp.
这把小折刀的刀片虽小但很锋利。
Use pocketknives naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把pocket（口袋）和knife（刀）拼在一起，想象刀片折进刀柄、能放进口袋的小刀。
语域：neutral 常见场景：everyday conversation、outdoor activities、written descriptions pocketknife 为中性常用词，日常口语和书面语都常见；具体场合中正式程度自然变化，无需特别回避。多用于描述可折叠、可放进口袋的小刀。
pocketknife 的末尾 /naɪf/ 与 knife、penknife、jackknife、life、wife 的 /aɪf/ 押韵（最后的重读元音及之后读音一致）。注意 pocket /ˈpɒkɪt/ 只是 pocketknife 的开头部分，拼写相似但读音不同，不押韵。penknife 和 jackknife 是透明的复合词，末尾都是 -knife。
Dictionary facts from ECDICT, WIKTIONARY.