To lead with a comparison, start with with / and跟 A than / compared to比((after a verb) indicating…起来), then comment on B — "compared with A, B is …." This sets the standard first, then makes the point. (Here, with / and跟 ≈ and / with和; with / and跟 is slightly more common.) B can also begin the sentence.
Structure: 跟 + A + 比(起来) ,B + Comment
compared with跟Shanghai上海比my,我hometown老家的prices物价very很low低。
Compared with Shanghai, prices in my hometown are very low.
the younger sister妹妹compared with跟the elder姐姐比起来a bit有点shy害羞。
Compared with her elder sister, the younger one is a bit shy.
remember: with / and跟 A than / compared to比 means "holding it up against A…" — benchmark first, verdict second. Note that unlike a bare than / compared to比 sentence, this structure allows degree / adjective linker很 ((commodity) prices物价degree / adjective linker很low低), because it functions as a comment rather than a direct A-than / compared to比-B construction.
Watch out
- For a plain "A is more X than B," the basic than / compared to比 suffices: Athan / compared to比Bhigh高.