Broodstock whether the breeding period, the performance can be observed through the fish. Common to several tail goldfish in the container chasing each other, play, roll, and so on, very active performance. This indicates that the goldfish has reached breeding time, may lay their eggs fertilized and reproduce. Should now do all the work required to breed. Waiting for goldfish eggs fertilized. Or the use of artificial breeding methods. Goldfish breeding, can be divided into two kinds of reproduction, natural reproduction and artificial propagation.
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Recently people are active in the study on high performance modification techniques for PP. Some very important modification techniques for PP are introduced in this paper.
有关聚丙烯的高性能化技术的研究近年来十分活跃，本文仅介绍其中几种典型的改性技术，供大家参考。
U. S. student performance in class is very active, and teachers of the problem as easy as chatting with friends, participation in the classroom so they usually are out of the appraisal.
美国学生在课堂上表现的非常活跃，和老师探讨问题就像与朋友聊天一样轻松，因此他们在课堂参与度的考评上通常都是满分。
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