70 refers to age. In the traditional culture of China, 70 years old is considered as a key stage of life, which means that a person has experienced many years of vicissitudes and experienced the storms of the world. At this age, people pay more and more attention to family and social relations, and also pursue inner peace and self-realization.

70 means diamond wedding. The 70th wedding anniversary is called diamond wedding, which symbolizes the pure, solid and precious love and marriage between husband and wife. Being able to get together for 70 years requires not only tacit understanding and understanding, but also emotional precipitation and mutual support. Therefore, if someone reaches this milestone, then both sides must be happy enough and hard to come by.

70 refers to the explosion index. In scientific research, the explosion index is often used to measure the explosion risk of a substance. 70 is a relatively high value of explosion index, which means that this substance is easy to cause explosion and needs special care and strict control. In practical application, we need to be careful with these substances to avoid dangerous accidents.