近年来在我国一些中小城市，在内部人口流失、商业数字化、消费结构转型等变革的综合作用下，部分传统商业街区陷入空置、衰退的发展困境。                                

Surveying is the technology of detecting the relative position of a point that is at the surface of the earth (or above or below the surface of the earth). There are different types of surveying techniques like geodetic surveys, cadastral surveys, engineering surveys, aerial surveys, mining surveys, and hydrographic surveys

A supercomputer is a computing device that performs at or near the highest operational rate of all computers currently available. Supercomputers engage in extremely fast data processing, with number-crunching (computational) power being measured in terms of a hundred billion floating-point operations (gigaflops). They rely on parallel-processing technology and use complex programs in modeling scientific and technological applications, such as meteorological phenomena, economic behavior, and nuclear react

Stout and porter beer are types of craft beer. Stout is a dark, top-fermented beer with a number of variations, including dry stout, Baltic porter, milk stout, and imperial stout. Porters are dark beers with big chocolate and coffee aromas and flavors. The only main difference between stout and porter beer is the kind of malt that is used to brew each type of beer. Porters use malted barley, and stouts are primarily made from unmalted roasted barley.

Stock video refers to pre-recorded footage or clips that are produced for the purpose of licensing and usage in various media productions. These video clips are usually made available for purchase from stock video libraries or websites and can be used in movies, TV shows, advertisements, websites, and others. Stock videos provide a convenient option for creators of movies, TV shows, advertisements, websites, and others to find and incorporate high-quality footage into their projects without the need to carry out costly and timeconsuming production processes afresh

Snus is a form of smokeless tobacco that undergoes a special manufacturing process. Snus is steampasteurized, unlike dipping tobacco which is fire-cured. Swedish food regulations, which apply to the manufacturing of snus, limit the permitted amounts of certain components in snus products.

Steam cleaners are cleaning appliances that use steam to quickly clean, dry, and sanitize inanimate surfaces that carry infectious organisms. They are also known as wet/dry vacuum cleaners. By end-users, the global steam cleaner market is dominated by the commercial segment, followed by the residential segment.