正常物品（normal good），是指需求量与收入呈同方向变化的商品。对于正常物品来说，替代效应与价格成反方向的变动，收入效应也与价格成反方向的变动，在它们的共同作用下，总效用必定与价格成反方向的变动，正因为如此，正常物品的需求曲线是向右下方倾斜的。
地震幸存者返回家园，收集他们能找到的物品，凭吊他们的损失，并试图从支离破碎的生活中找回某种正常的感觉。
Earthquake survivors return to their homes to collect what they can find, to mourn their losses, and try to find a sense of normalcy in lives that have been ripped apart.
正常衰老与病理衰老在物品短时记忆与语义长时记忆的减退速率上有显著的差异。
Rates of decline of object short term memory and semantic long term memory had significant difference between normal and pathologic aging.
杨利伟进一步解释说：“我们的很多物品在上天前都是有大气压封到里面，随着在太空中飞行，可能会泄压也会有一些声音发出，这样的话需要我们去辨认，我想这些都是很正常的事情。”
He said air leaking out of the objects in the capsule could also cause noise. "I think it is normal," Yang said. "it is necessary to carefully identify the cause."
应用推荐