尽量不要高声喧哗或是不自然地讲话。Try to avoid shouting or speaking unnaturally.在公共汽车上大声喧哗是一种粗鄙的行为.Talking loudly on a bus is a sign of vulgarity.周未时,海滨上满是喧哗的游客[度假者].At weekends the beach is crowded with noisy trippers....
N - acetylcysteine a precursor of glutathione in cells, is a thiol antioxidant.乙酰半胱氨酸是细胞内还原性谷胱甘肽的前体, 是一种含有巯基的抗氧化剂.Thus, glutathione provides important protection against many environmental hazards.谷胱甘肽因而对许多环境有害物提供了重要的保障....
He studied the cards, each with its different numerals.他仔细看了看牌, 每张牌上的数字都不相同.A table comparing numerals in two different numeral systems.一种可以比较两种不同数制中的数字的表格.He learned to write the numerals before he went to school.他在上学前学...