peril
peril/ˈperil/n.［u］&［c］危险；危险的事物：You could well place us both in peril.你很可能会使我们俩都处于危险之中。The refugees were in peril of death from hunger.难民有饿死的···
period/periodic/periodical
period/ˈpiəriəd/n.［c］1.周期;时期，时代，期间：a period of hot weather一段时期的热天We lived in Beijing for a period.我们在北京住了一段时间。2.现代，当代(与定冠词连用): the you···
peripheral
peripheral/pəˈrifərəl]/adj.外围的；非本质的：the peripheral areas of Europe欧洲的边缘地区；peripheral devices of the computer计算机的外围设备；peripheral members of a sentence句···
perish
perish/ˈperiʃ/vt.&vi.1.丧生，凋谢: perish in battle阵亡；perish from disease病死Flowers perish when frost comes.霜冻时花卉凋零。2.毁灭，消亡: Oil on your car tyres will peris···
permanent
permanent/ˈpə:mənənt/adj.永久(性)的，固定的：permanent force常备军；permanent observation station永久观察站；a permanent committee常设委员会；permanent resident(PR)永久居民
permeate
permeate/ˈpə:mieit/vi.&vt.1.影响，漫遍，遍布: Smoke permeated the house.整个房子烟雾弥漫。2.渗入，渗透(与through或among连用)：water permeating (through) the soil水渗透到泥土里···
permissible
permissible/pəˈmisəbl/adj.可允许的，许可的：Is smoking permissible in the theater?剧院允许抽烟吗? It is not permissible for children to bring their pets to school.不允许孩子们带···
permission/permit
permission/pə(:)ˈmiʃən/n.［u］允许，许可，准许：ask for permission请求许可；without permission未经许可You have my permission to leave.我准许你离开，你可以走了。permit/pə(:)ˈm···
perpetual
perpetual/pəˈpetʃuəl/adj.永久的，永恒的，长期的：the perpetual calendar万年历；a perpetual motion永恒运动；the perpetual snows of the mountain tops山顶经年不化的积雪
