Not to mention… just… already… (且不说)

Structure 且不说/姑且不论 + larger point，单/光 + smaller point + 就 + conclusion

且不说 (qiě bù shuō) sets aside, for now, a larger point in order to rest on a smaller one that already suffices: 且不说路远，单是天气就够受的了 = "not to mention how far it is, the weather alone is already unbearable". The second clause is introduced by 单/光 ("just, merely") and closed with 就. The cultured variant is 姑且不论 / 姑且不说 (gūqiě bù lùn/shuō), which carries the "for the moment" sense of 姑且 and reads more like essay or news prose.

Examples

且qiě不bù说shuō路lù远yuǎn，单dān是shì天tiān气qì就jiù够gòu受shòu的de了le。
Not to mention how far it is, the weather alone is already unbearable.
姑gū且qiě不bù论lùn质zhì量liàng如rú何hé，光guāng是shì价jià格gé就jiù让ràng人rén望wàng而ér却què步bù。
Setting aside the question of quality, the price alone is enough to put one off.
且qiě不bù说shuō工gōng程chéng之zhī大dà，单dān是shì预yù算suàn就jiù难nán以yǐ承chéng担dān。
Not to mention the scale of the project, the budget alone is already hard to bear.

Levels are indicative: they follow the standard Chinese Grammar Wiki (AllSet Learning) progression, not an official HSK 3.0 mapping. We never assign levels by eye.

This point and the other 370, with audio on every example, inside Wanyu.