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Let's first look at China's new conventional-powered submarines. Satellite photos reveal the features of the new submarines, which are eye-catching. Their stronger stealth and better quietness have greatly improved their underwater combat capabilities. This is not only a technological breakthrough, but also reflects my country's strategic considerations and long-term planning in the field of national defense.

Let's talk about overseas express delivery. With the booming development of e-commerce, overseas express delivery business is becoming increasingly busy. Packages from afar carry people's expectations for a better life. Behind this is the efficient operation of the global logistics network and the prosperity of cross-border trade.

Although new submarines and overseas express delivery belong to different fields, they are both affected by the process of globalization. Globalization has accelerated the exchange of technology and promoted the innovation of submarine technology; it has also promoted the rise of e-commerce and created the prosperity of overseas express delivery.

From an economic perspective, overseas express delivery to doorsteps has promoted consumption upgrades. Consumers can easily obtain global goods to meet their diverse needs. This has driven the development of related industries and created numerous employment opportunities.

However, overseas express delivery to door also faces some challenges, such as logistics cost control, package security, and cross-border customs clearance efficiency. But it is these challenges that drive the industry to continuously optimize and innovate.

The development of new conventional-powered submarines is crucial to maintaining national security and maritime rights and interests. It enhances my country's strategic deterrence in the maritime field and provides a strong guarantee for the country's peaceful development.

In short, whether it is the progress of new submarines or the development of overseas express delivery, they all reflect the changes and needs of the times. We should face these changes with a positive attitude, make full use of the opportunities they bring, and strive to cope with possible challenges.