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"Then it was the old method of tracing armour-piercing firebombs that repelled the attacks of the big wasps twice. There was another very special sound from the position. At first we thought there was another big wasp coming, But after looking at it for half a day, I didn't find anything. After a little while, It is also the kind of special sound that is getting closer and closer. Only then did I recognize that it was not the "buzzing" sound of the big wasp, But a sound of "knowing, knowing, knowing, knowing, knowing, Taken out with 'creaking', It's like a lot of people grinding their teeth together, Then a piece of black came running in the direction of the position. This time the direction is straight ahead, At first those things were far away from us and we could not see them clearly with our naked eyes. It was an instructor with a telescope who looked through the telescope and saw that the thing was a lot of mice. And they are all very big, After the news spread throughout the position, I have all my comrades, All ready for battle, Knowing that this is like one of those big wasps, It is certainly not a good fault, Just thinking of starting to fight the newcomers when it comes closer, I didn't think they were about 100 meters away from the position. It stopped suddenly, At the beginning of digging holes collectively, I felt that they were digging holes faster than running on the flat ground. One by one, they almost disappeared from the ground in an instant. Soon, a large area of dark mice disappeared. Looking through binoculars, on the ground where they disappeared, there were many holes the thickness of sea bowls, which were almost denser than craters.想求亲的人家过几年工夫再来。面对两难的境遇，他们勇敢面对， 也努力让父母直面了自己的问题。在不同关系的爱中， 他们教会了自己成长，明晰了自己的内心一唯有直面原生家庭的影响，以家人之名相互治愈，才能清醒无畏的走下去， 成为更好的自己。尹旭轻轻将范依兰抱在怀中，满是爱抚。"Is-A" refers to the "one" of one class and belongs to another class, while "Has-A" is different, which indicates that a certain role has a certain responsibility. A common reason for the wrong use of inheritance instead of aggregation is to mistakenly treat "Has-A" as "Is-A". For example:In the aspect of supporting education, we combine our own special skills to give lectures to junior high school children. The materials include: First of all, we tell our university life so that they can better understand the university campus and promote their thirst for knowledge. Secondly, we pass on the experience of self-success and learning to them to help them improve their learning efficiency.