1 in the figure (marked as 1 in the figure) This is an "expansion symbol", which is usually marked above the sound, indicating that the sound needs to be expanded; Sometimes it is also marked on the bar line, indicating that there can be a proper pause between two bars.

Figure 2 (marked in the figure) is a "smooth line" symbol, which connects two or more sounds with different pitches, and requires roundness and coherence when playing (the score of singing is often used to pronounce a word).

I hope it helps you.