The plus sign is used in addition and the minus is used in subtraction.加号用于加法;减号用于减法....using concrete objects to teach addition and subtraction.用实物来教加减法There will be simple tests in addition, subtraction, multiplication...
我有两个助手协助经营。I have two assistants who help with the admin.他上一季在协助英吉利海峡隧道的电缆铺设工作.He was helping wire up the Channel Tunnel last season.他协助招募志愿者到巴基斯坦打仗。He helped to recruit volunteers to go to Pakistan to fight....
液泡中的丹宁内含物也已用显微镜证实.Tannin inclusions in vacuoles have also been demonstrated by the electron microscope.液泡内含物存在于幼嫩种子胚乳的脂肪珠滴中.Vacuolate inclusions are present in the fat globules of the endosperm of young seeds.I1等级的钻石常含有肉...