densic contact

例句：

1. 1. The two scientists had a dense contact during the research.
   这两位科学家在研究期间有紧密接触。
2. 2.The team worked closely together to achieve their goal.
   团队密切合作以实现他们的目标。
3. 3. Due to the dense contact, the virus spread quickly.
   由于紧密接触，病毒迅速传播。