bulk up
bulk up 常指通过饮食和锻炼增加肌肉量，多为不及物用法。
He has been bulking up at the gym.
他一直在健身房增肌。
膨胀；扩大；增大；显得重要；显得巨大；散装贮存；散装装运；显得；好像,就体积或程度而言。；变大；膨胀或扩张。
To gain body mass, especially muscle, through diet and exercise.
显得；好像,就体积或程度而言。
To appear or seem to be, as to bulk or extent.
变大；膨胀或扩张。
To grow in size; to swell or expand.
通过饮食、锻炼等增加体重。
To gain body mass by means of diet, exercise, etc.
散装存放或持有。
To put or hold in bulk.
一般现在时
The report bulks up to over 100 pages.
这份报告篇幅超过100页。
一般过去时
The computer bulked large in the room.
那台电脑在房间里显得很大。
现在进行时
The clouds are bulking up on the horizon.
云层正在地平线上聚集增大。
bulk作为动词是规则变化，过去式和过去分词加-ed。
The unresolved issues bulked large in their discussions.
未解决的问题在他们的讨论中显得很重要。
用法提示：此处'bulked'是不及物动词，与'large'搭配表示'显得重要'。
He has been bulking up by lifting weights every day.
他每天通过举重来增加肌肉。
用法提示：此处'bulking up'是动词短语，表示'增大体积'，尤指肌肉。
The company bulked its product line by adding new flavors.
公司通过增加新口味来扩大产品线。
用法提示：此处'bulked'是及物动词，表示'扩大、增加'。
bulk up 常指通过饮食和锻炼增加肌肉量，多为不及物用法。
He has been bulking up at the gym.
他一直在健身房增肌。
bulk large 是较正式的书面表达，意为‘显得突出或重要’，主语多为抽象事物。
The issue of safety bulks large in the discussion.
安全问题在这次讨论中显得很重要。
bulk out 可用作及物动词，后直接接宾语，常搭配 with 表示所用的材料。
She bulked out the essay with more examples.
她用更多例子充实了那篇文章。
grammar · medium
易错句子I want to bulk my body.
正确表达I want to bulk up my body.
表示“增肌/增重”时，bulk 是不及物动词，通常与 up 构成短语动词 bulk up，不能直接把宾语接在 bulk 后面，所以应改为 bulk up my body，或直接说 bulk up。
grammar · medium
易错句子This issue bulks importantly in the election.
正确表达This issue bulks large in the election.
bulk 在这个义项（显得重大/重要）中要用固定搭配 bulk large，large 不是修饰动词的方式副词，不能用 importantly 代替；bulk large 意为“显得重要、变得突出”。
增肌；增加体重
He has been bulking up by lifting weights and eating a lot of protein.
他一直通过举重和吃大量蛋白质来增肌。
显得重要；显得突出
The problem of climate change bulks large in today's political debate.
气候变化问题在当今政治辩论中显得尤为重要。
使…更厚实；充实
She bulked out her article with a few more examples.
她用更多例子充实了她的文章。
健身增肌时，bulk 常与 muscle 搭配，表示增加肌肉量。
bulk up 常见于谈论通过 workout 来增大体格。
增肌时期需补充蛋白质，与 bulk 的饮食增重含义相关。
增加体重需要摄入更多卡路里，是 bulk 话题里的常见词。
bulk 作为动词常指增加 body mass，mass 是同一语义场的核心名词。
显得重要；起重大的作用
The problem of poverty bulks large in the government's agenda.
贫困问题在政府的议程中显得极为重要。
增重；变得更强壮
She has been bulking up with protein shakes and weightlifting.
她一直在通过蛋白奶昔和举重来增肌。
大量地；成批地
It's cheaper to buy rice in bulk.
批量购买大米更便宜。
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Dictionary facts from ECDICT, OCTANOVE, WIKTIONARY, WORDNET.