"Hold up"和"Keep up"虽然都含有"维持"的语义，但在用法上存在明显差异：
1. Hold up
(1) 基本含义：物理性支撑
例：The pillars hold up the roof.（柱子支撑着屋顶）
(2) 引申用法：
-- 延误：The flight was held up by fog.（航班因大雾延误）
-- 持械抢劫：The bank was held up yesterday.（银行昨日遭抢劫）
...(以上内容有节略,please sign in for more)
主题笔记
word-vs-word-cn
【hold up】 —
1. (of a structure, etc.) stay erect; remain in good condition:
- This building holds up well despite its age.
2. (of weather, supplies, etc.) continue; last:
- Will the water supply 【hold up】 through the summer?
3. remain in control of oneself:
- How does he 【hold up】 under such a responsibility?
【keep up】 —
1. not drown:
- The sailors managed to 【keep up】 for several hours and were eventually picked up by a lifeboat.
2. (of spirits, morale, etc.) remain high:
- His courage kept up in the face of danger.
3. = 【hold up】 2:
- Do you think this fine weather will 【keep up】 for a couple of weeks?
4. stay in touch:
- I’m afraid we haven’t kept up at all since she went abroad.
5. = 【hold up】 3:
- But for her courage, I never could have kept up through all this terrible trial.
6. not fall behind:
- If the children can 【keep up】 , we will take them with us when we hike into town.
