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我的青少年时代在黄土高原腹地甘肃省定西市安乐村度过。每逢暑假，我和哥哥总会在外婆家住几天。外婆家不远处那片被庄稼层层环绕的黄土山，是我最熟悉的风景。我们经常踩着田埂间没膝的狗尾巴草与蒲公英，深一脚浅一脚地攀爬。那时的我还不知道，这片承载童年欢声笑语的“土山”，是第四次全国文物普查中新发现的北宋故城遗址——张川城遗址。这15到20厘米厚、层层叠叠的夯土层里，竟藏着古人筑城戍边的智慧。那些与庄稼共生的黑釉、褐釉陶瓷片，曾是北宋先民碗碟中的烟火生活，沉淀着上千年的光阴。
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Your contacts as a living garden. Green and blooming means thriving. Wilting? Time to reach out. No guilt, just a gentle nudge.
Commutativity and associativity might sound the same, and indeed most commutative operations are also associative. But there are a few math operations that are only one or the other. Matrix multiplication, for example, is associative but not commutative Matrix multiplication - Wikipedia en.wikipedia.org/wiki/Matrix_multiplication#Non-commutativity . And surprisingly, floating point arithmetic — i.e. any math operator in JavaScript — is commutative but not associative Associative property - Wikipedia en.wikipedia.org/wiki/Associative_property#Nonassociativity_of_floating_point_calculation ! ↩
Трамп допустил ужесточение торговых соглашений с другими странами20:46