Through the practice of superior tree collection at Shuigou Forest Farm of Luoping county since 1999, a set of technology on establishment of superior tree collection site was summarized.
通过自1999年在罗平县水沟林场开始的杉木优树家系收集建设的实践，总结完善了杉木优树收集区的营建配套技术。
However, suppose that a tree falls on the superior pig before it has produced offspring.
然而，假定在这只良种猪产出小猪以前，它被一棵倒下来的树压死了。
The two-part rubber tree (Hevea brasiliensis) is a superior clone grafted on a seedling family.
在橡胶树优良有性系实生苗上嫁接优良无性系，即形成两合树。
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