sustain [səˈsteɪn]

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vt.保持，供养，维持，支持，经受

to cause or allow something to continue for a period of time

During the war we had just enough food to sustain us. 战争期间，我们的食物仅够维持生活。
These four posts sustain the entire building. 这四根柱子支撑着整座建筑物。