sustain

back, uphold, support, sustain, advocate

这些动词均有“支持，支援，拥护”之意。
back: 通常指对论点、行动、事业等的强有力支持。
uphold: 既可指积极努力对陷入困境者的支持，也可指给某人在行动、道义或信仰上的支持。
support: 含义广泛，多指在道义上或物质上支持某人，也可指对某项事业的支持。
sustain: 侧重指连续不断的支持。
advocate: 多指通过写文章或发表演说等来支持或拥护，往往暗示提倡某事或为某事辩护。

undergo, experience, sustain, suffer

这些动词均有“经历，经受，遭受”之意。
undergo: 多指经受艰难、痛苦、不愉快或危险等事。
experience: 指亲身经受或体验某事。
sustain: 指遭受痛苦或承受负担。
suffer: 常可与sustain通用，尤指受到损害或伤害。

动词 sustain:

1. lengthen or extend in duration or space
   同义词：prolong, keep up
2. undergo (as of injuries and illnesses)
   同义词：suffer, have, get
3. provide with nourishment
   同义词：nourish, nurture
4. supply with necessities and support
   同义词：keep, maintain
5. be the physical support of; carry the weight of
   同义词：hold, support, hold up
6. admit as valid
7. establish or strengthen as with new evidence or facts
   同义词：confirm, corroborate, substantiate, support, affirm

1. The court sustained his claim that the contract was illegal.
   法庭确认他的要求正当，宣布该合同不合法。
2. Hope alone sustained him in his struggle.
   在奋斗中，只有希望支持着他。
3. The foundations were not strong enough to sustain the weight of the house.
   这地基不够牢固，无法承受房屋的重量。