weekly和week's在发音，词性和意思上存在不同：

weekly:['wikli]

adj. 每周的；周刊的；一周一次的

例：You do not use an aid sheet on the weekly test.

在每周的测试中你们不能使用辅助材料。

n. 周刊

例：The best weekly is The Economist. The best daily is theWall Street Journal.

最好的周刊是经济学家。最好的日报是华尔街日报。

adv. 每周一次；逐周

例：The menu changes weekly and usually includes a vegan option.

菜单每周都有变化，通常包含可供严格的素食者选择的菜肴。

week's:['wikz]

pron.相当于代词，一周的

例：He was saving his energy for next week's race in Belgium.

他正为下周在比利时的比赛养精蓄锐。

以weekly newspaper与week's newspaper为例，weekly newspaper是周刊、周报的意思，而week's newspaper表示那一周的报纸。