birth: n.1.出生，诞生；生产，分娩。2.出身，家系；血统；门第，家世。3.起源，开始。4.〔古语〕产物，产儿。短语和例子the date of one's birth 生日。 A still [difficult] birth 死[难]产。 Five young at a birth 一胎产五仔。 A person of birth [of no birth ] 出身高贵[卑微
Birth and death chain in random environment 马氏环境中的生灭链
2.
The birth and death chain in a random environment and the single birth chain in a random environment are two important models of markov chain in a random environment 随机环境中生灭链和随机环境中随机游动是随机坏境中马氏链的两类重要模型。
3.
Extinction probabilities for the birth and death chain in a random environment - a special case of the single birth chain in a random environment are also obtained and the results are applied into examples 随机环境中生灭链作为随机环境中单生链的特例，相应的结果也在文中得到，并应用到具体的例子。
