1But almost all have ignored the big, profitable opportunity in their own backyard: the wholesale food and drink trade, which appears to be just the kind of market retailers need.
主干主语：almost all (retailers)；谓语：have ignored；宾语：the big, profitable opportunity
结构冒号后的 "the wholesale food and drink trade" 是 opportunity 的同位语，具体解释这个机会是什么；其后 "which appears to be just the kind of market retailers need" 是非限制性定语从句修饰 trade，该从句内部又嵌套一个省略关系词的定语从句 "retailers need"，修饰 market。in their own backyard 是介词短语作后置定语，含比喻义。
译文但几乎所有零售商都忽视了自家后院那个巨大而有利可图的商机——食品饮料批发业，而这似乎正是零售商所需要的那种市场。
考点in one's own backyard 比喻「近在眼前的地方」，不要直译为「后院」 · 定语从句中嵌套省略 that 的定语从句 "retailers need"，是考研高频考点
2Big retailers must understand these differences before they can identify the segments of European wholesaling in which their particular abilities might unseat smaller but entrenched competitors.
主干主语：Big retailers；谓语：must understand；宾语：these differences
结构主句后接 before 引导的时间状语从句，注意 before 常需译为「……之后才……」；状语从句中谓语 identify 的宾语 segments 被介词提前的定语从句 "in which their particular abilities might unseat smaller but entrenched competitors" 修饰，从句主语是 abilities，谓语是 unseat，宾语是 competitors。unseat 本义「使失去席位」，此处引申为「挤垮、取代」。
译文大型零售商必须先了解这些差异，然后才能确定在欧洲批发业的哪些细分领域中，自己特有的优势能够挤垮那些规模较小但根基稳固的竞争对手。
考点before 引导时间状语从句的译法：「先……才能……」 · "介词+which" 引导的定语从句，in which 相当于 where，指「在这些细分领域中」
3Demand comes mainly from two sources: independent mom-and-pop grocery stores which, unlike large retail chains, are too small to buy straight from producers, and food service operators that cater to consumers when they don't eat at home.
主干主语：Demand；谓语：comes from；宾语：two sources
结构冒号后列举两个并列的需求来源，各带一个定语从句：第一个来源 stores 由 which 引导的定语从句修饰，从句中插入 "unlike large retail chains" 作比较状语，主干是 "are too small to buy straight from producers"（too...to...结构）；第二个来源 operators 由 that 引导的定语从句修饰，从句内又含 when 引导的时间状语从句。
译文需求主要来自两个方面：一是独立的夫妻杂货店，与大型连锁零售商不同，它们规模太小，无法直接从生产商进货；二是餐饮服务商，为不在家吃饭的消费者提供餐饮服务。
考点too...to... 结构表示「太……而不能……」 · 并列宾语各带定语从句，注意第二个定语从句的先行词是 operators，不要误判修饰对象