前若虫

It was found that the RBSDV particles infected in the maize cell appeared at first in the cytoplasm near the cell wall, some single virus particles seem to be connected with plasmodesma.

的症状发展过程先后取叶脉做超薄切片，在透射电镜下观察病毒在细胞内的侵染状态，并在取样前用灰飞虱无毒若虫进行饲毒和传毒试验。

Wing bud differentiation initiated at the early 5th nymphal instar, during which the front wing bud cells in the macropterous proliferated much more rapidly than those in the brachypterous. The hinder wing buds of the brachypterous degeneratd at middle 5th instar and finally turned out to be very little wings.

在5龄初始时才发生翅芽发育的分化，之后，短翅型若虫的前翅芽细胞增殖速度明显慢于长翅型，到五龄末期，细胞数量积累明显少于长翅型，短翅型的后翅芽在5龄中期开始退化变短，羽化后变成一个退化的小翅。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。