例句與造句

1. single side birth death chain of order 2 in random environment is the extension of random walk in random environment, this paper discusses the recurrence, positive recurrence and null recurrence of single side birth-death chain of order 2 in fixed environment and random environment respectively based on the relation between birth death chain of order 2 and branching chain in time environment, and gives some sufficient and necessary conditions and sufficient conditions
   摘要隨機(jī)環(huán)境中單邊二重生滅鏈?zhǔn)请S機(jī)環(huán)境中單邊隨機(jī)游動的推廣，本文利用單邊二重生滅鏈與依時分枝鏈的關(guān)系，分別給出了固定環(huán)境及隨機(jī)環(huán)境中二重生滅鏈的常返，正常返和零常返的幾個充要及充分條件，隨機(jī)環(huán)境中的單邊隨機(jī)游動的常返性的相應(yīng)結(jié)果可以作為本文的推論。
2. It's difficult to find null recurrence in a sentence. 用null recurrence造句挺難的