vt. 保持;保留;遵守;阻止;
vi. (食品)保持新;保持健康;
n. 保持,保养;供养,抚养;生活,生计;饲料;牧草;
🗣️ 情景例句
I did not notice it until yesterday.
我一直到昨天才注意到它。
Well, it's too bad that you have to go.
哦,真遗憾,你一定要走。
This shows how long it was before we deemed it necessary to make sure that all our children could share in the knowledge accumulated by the'happy few' during the past centuries.