Many forest tree species have multiple archegonia which, after fertilization produce a number of proembryos.许多林木树种都有颈卵器, 受精以后便产生许多原胚.A similar section through the female plant reveals several bottle - shape archegonia , ...
...lavatories that often freeze up in winter...在冬季经常完全冻住的抽水马桶But there would be no public lavatories in a quarter like this.可是在这样的地方是找不到公共厕所的.Now most families use lavatories, which are very convenient and clean.现在大多数家庭都...