What do the serve "arch" and "soft" in table tennis mean respectively?

Good landlord,

Did you watch Malone's serve teaching video? I saw it, too. . . Malone's serve is really BT. . . It shook its head. . . .

I remember Malone said that the serve was a little "arched", which was when the serve was topspin, so I think it might mean that the arc was longer, the top was a little bit (but the second jump was still in the table) and the forward spin was a little bit. . . .

And it's a little "soft". I feel that when I serve the spinning ball, I will use more force on the friction rotation and only give the ball a small forward force. . . This backspin is hard to borrow. . . If you grab it, it will be easy to get off the net once the front is not enough. . . At the same time, short swing is not easy to borrow, easy to swing, not short swing, high ball. . . .

The above are personal opinions and are for reference only.

I wish the landlord a good game! ! ! ! Please continue to discuss O(∩_∩)O~