Metropolis and Transportation: For mankind, a ‘city’ was a ‘place’ where people were born, grew up, and eventually died. It was initially difficult for humans to choose a ‘place’ to live. Humans had to follow the fate they were given. However, with the development of transportation and the widespread adoption of online networks, humans have been able to select their own places of residence. Throughout history, humans have only been able to voluntarily choose where they want to live for a short time. Achieving freedom of movement marks a fundamental change in the form and character of cities. The development of transportation has completely transformed our lives. The emergence and evolution of transportation means, such as electric vehicles and high-speed trains, indicate that we are in the middle of a revolution that humanity is experiencing for the first time. If you do not respond to these changes, you will face difficulties. - Joseph’s “just my thoughts”
"Apples are the fruit" is a true proposition. At this time, "apples" are a Sufficient Condition to be fruit, and vice versa, because the "fruit to be an apple is more necessary for other conditions such as "red, round", the fruit is a Necessary Condition to become an apple. If the proposition of "If you respect someone, you'll get married" is "true," it's a "Sufficient Condition" to find someone you admire for marriage, but it's just only a "Necessary Condition" to find someone to marry for respect. Even with respect, you can not get married. You can't get married even if the Reverse Proposition is "true." Because marriage is a matter of "choice" before conditions or needs. If you want a respectable man, you can find a great man. To live comfortably, you can find a rich man. So, is there no Necessary-Sufficient Proposition for a marriage (conditions where both the proposition ...