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Another reason may be the quality of the windshield. A windshield normally can endure 30,000 take-offs and landings. Substandard windshield will age faster. Sometimes windshield may be replaced.

Any so-called "sanctions" by the US will never shake the determination of China to safeguard national sovereignty, security and development interests, as well as the long-term prosperity and stability of Hong Kong, it added.

Apart from Hong Kong's well-established legal system, it has a solid infrastructure, a sound banking system, free flow of capital, low tax rates, and a highly regarded regulatory regime, he explained.

Apart from sightseeing, more Chinese tourists now opt to experience the cultural essence of their destinations by visiting local museums.

Apart from observation, many countries have proposed asteroid space exploration plans. According to Ji, since some asteroids have been found to possess abundant resources such as water and metals, many European and American companies are preparing to carry out asteroid mining programs.