3 sentences

1. 这似乎不是一个经过深思熟虑的计划。

   zhè sì​hū bù shì yī gè jīng​guò shēn​sī​shú​lǜ de jì​huà.

   This doesn't seem like a well-thought-out plan.

   Source: OpenSubtitles

2. 这个计划是经过深思熟虑后才制定的。

   zhè​gè jì​huà shì jīng​guò shēn​sī​shú​lǜ hòu cái zhì​dìng de.

   This plan was formulated after careful deliberation.

   Source: Dong Chinese Dictionary

3. 两人经过一番深思熟虑，决定共同商议并共谋大事。

   liǎng rén jīng​guò yī fān shēn​sī​shú​lǜ, jué​dìng gòng​tóng shāng​yì bìng gòng móu dà​shì.

   After some careful consideration, the two decided to deliberate together and plan for great things.

   Source: Dong Chinese Dictionary