seed stand的用法和樣例：
例句
- Seed crops are collected from both natural stands and plantations which may have been culled to form seed stands.
種子采自天然林和人工林，兩者都可能是經(jīng)過(guò)去劣留優(yōu)作為母樹(shù)林的。 - This pest is harmful to the main tip of red pine,and influences the timber production rate and timber quality of red pine ,down to seed quantities of mother forests.
此蟲(chóng)危害紅松主梢，影響紅松的出材率和材質(zhì)以及母樹(shù)林的結實(shí)量。
