Great thoughts on the first one

synchronized... This would could have different man's. E.g same speed, or they started at the same time from their starting points... The first, but the second, one is not necessary. 

所有跟帖： 

• 第一题是简单两人相向走题。第二是从极地到赤道，类似第一题得到的点连在一起成曲线，两个半球各有一条。第三题不知道， -dhyang_wxc- ♂ (74 bytes) () 11/24/2023 postreply 06:25:43

• 思路很好，再深入一下就解决了。 -大酱风度- ♂ (0 bytes) () 11/24/2023 postreply 09:16:57

• "Synchronized " just means they start the same time, -中间小谢- ♂ (277 bytes) () 11/24/2023 postreply 08:38:21

• 棒！谢谢确认！ -大酱风度- ♂ (0 bytes) () 11/24/2023 postreply 09:05:03