What is the connection between three-character or four-character idioms?

What are the following idioms? One by one.

The following idioms begin with welcome, etc.

Welcome dust, one by one, one by one, one by one, unable to catch stubble, overwhelmed, shoulder to shoulder, three to nine, whispering, dust to ears, three to four, cigarettes, people and things, shoulder to shoulder, long extension, contact voltage, poor contact, expensive climbing, grounding resistance, contact resistance, receiving data.

One by one: one by one, one by one.

One by one, without interruption.

One by one: refers to people coming one after another with their front feet followed by their back feet. Describe a lot of new people, an endless stream.

One by one: refers to people coming one after another with their front feet followed by their back feet. Describe a lot of new people, an endless stream.

Connect sleeves to form curtains: sleeves of clothes. Curtains: Curtains. Sleeves are joined together to form a curtain. Describe a large population and a prosperous city.

Three even four: one by one.

Side by side: heel: heel. Heel contact, shoulder contact. Describe many people, one after another.

Welcome: it means to hold a banquet to entertain guests from afar to show sympathy and welcome.

After example:

1, at night, the stars are dotted, the lights are blurred, the silver stars are connected with the lamp beads, and the grassland at night is so quiet and serene, only the sound of quiet streams causes people to daydream about nature.

Looking eastward, a Xia Hong connects heaven and earth. Slowly, the sun smiled. The sun is very red, like a fire, and has not been irradiated by the sun. It seems to be very hot and roasted.

From a distance, the boundless sea seems to be connected with the sky. On the sea, flocks of seagulls are flying. Some of them spread their wings high on the sea, some of them skim over the water, some whisper on the sea, some fish happily on the sea, and each seagull becomes a happy note on the sea.

The flood linked our hearts together.

Just like the branches are connected with the trunk, the branches that leave the trunk will die soon.

6. Friendship is a slow-growing plant. Only by grafting on branches that are familiar with each other and love each other will they flourish.

7. I worked as an intern in the ENT department of the hospital. One day, I helped a small group directly fill in a handsome word on someone else's medical report, and then I stayed up late that night to write a critical letter.

8. The pipe cap is a pipe fitting welded on the pipe end or installed on the external thread of the pipe end to cover the pipe.

9. Each controller can be regarded as a front end connected to the monitoring network, which can be operated by the upper computer or off-network.

10. Connect two objects together. The connecting line can be curved or straight.