让厨房计时器开始计时。Set the kitchen timer going.这类计时器尚不能算是独立的计时器,还是天文仪器与计时仪器的混合体.These mixtures of astronomical instruments and time - measuring devices cannot be seen as independent time measurers.作为计时器,漏刻的使用比日晷史为普遍.Many ancient...
铁剂和叶酸片常被配给孕妇服用。Iron and folic acid supplements are frequently given to pregnant women.甜菜富含营养,包括叶酸, 铁元素和纤维素等.Beets are high in nutrients including folate, iron and fiber.叶酸能帮助防止诸如脊柱裂等神经管畸形出生缺陷的发生.Folic acid helps prevent ...