noun
pen or writing brush with water-insoluble ink
12塊路況指示牌都被辦假證者用粗黑的油筆留下了聯繫方式，一連串醒目的數字橫在地圖的中間。
12块路况指示牌都被办假证者用粗黑的油笔留下了联系方式，一连串醒目的数字横在地图的中间。
１２ kuài lù kuàng zhǐ shì pái dōu bèi bàn jiǎ zhèng zhě yòng cū hēi de yóu bǐ liú xià le lián jì fāng shì ， yī lián chuàn xǐng mù de shù zì héng zài dì tú de zhōng jiān ． An ID forger left his contact number on 12 road signs with a big black marker pen, leaving a string of eye-catching numbers on the center of the map.
或者用油筆把一些毛料露出的綠色部分塗住
或者用油笔把一些毛料露出的绿色部分涂住
huò zhě yòng yóu bǐ bǎ yī xiē máo liào lù chū de lǜ sè bù fen tú zhù or use a marker pen to cover the green parts of the woollen cloth
隨即上場的畫師則帶着彩色油筆，在其身上進行彩繪。
随即上场的画师则带着彩色油笔，在其身上进行彩绘。
suí jí shàng chǎng de huà shī zé dài zhe cǎi sè yóu bǐ ， zài qí shēn shàng jìn xíng cǎi huì ． The painter entered the stage with several colored pens and painted on her body.
noun, specifically
ballpoint pen
當時他用沒有油的油筆在粉筆頭上刻畫。
当时他用没有油的油笔在粉笔头上刻画。
dāng shí tā yòng méi yǒu yóu de yóu bǐ zài fěn bǐ tóu shàng kè huà ． He was carving on the head of a chalk with an inkless ballpoint pen at that time.
甚至有次被一隻劣質油筆迸出的彈簧傷了眼皮
甚至有次被一只劣质油笔迸出的弹簧伤了眼皮
shèn zhì yǒu cì bèi yī zhī liè zhì yóu bǐ bèng chū de tán huáng shāng le yǎn pí one time, he even hurt his eyelid from the spring that popped out from a faulty ballpoint pen
一本發黃的“手術記錄”清晰地記錄了手術中的情況，紅藍色油筆手繪的圖示非常準確地標明瞭血管以及輸尿管的吻合方式
一本发黄的“手术记录”清晰地记录了手术中的情况，红蓝色油笔手绘的图示非常准确地标明了血管以及输尿管的吻合方式
yī běn fā huáng de “ shǒu shù jì lù ” qīng xī de jì lù le shǒu shù zhōng de qíng kuàng ， hóng lán sè yóu bǐ shǒu huì de tú shì fēi cháng zhǔn què de biāo míng le xuè guǎn yǐ jí shū niào guǎn de wěn hé fāng shì A yellowing "surgery record" clearly records what happened in the operation, and the diagrams drawn with red and blue ballpoint pens accurately shows how the blood vessels and ureter are joined.
Examples (Wiktionary)
Mandarin
12块路况指示牌都被办假证者用粗黑的油笔留下了联系方式，一连串醒目的数字横在地图的中间。
12塊路況指示牌都被辦假證者用粗黑的油筆留下了聯繫方式，一連串醒目的數字橫在地圖的中間。
１２ kuài lù kuàng zhǐ shì pái dōu bèi bàn jiǎ zhèng zhě yòng cū hēi de yóu bǐ liú xià le lián jì fāng shì ， yī lián chuàn xǐng mù de shù zì héng zài dì tú de zhōng jiān ．
An ID forger left his contact number on 12 road signs with a big black marker pen, leaving a string of eye-catching numbers on the center of the map.