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...
Please advise me on the most suitable colour print film and some dos and don'ts.请向我推荐最合适的彩色胶卷，并告诉我一些注意事项。It won't do to hedge your pupils in with a thousand dos and don'ts.用无数清规戒律束缚学生是不行的.I saw Mr. Ts'...
在生态环境方面草原植被破坏严重, 草原沙化,草场退化, 土地盐碱化.In the aspect of environment destroy the plant, sandy grassland, saline soil.长江源区存在不同程度的沙化现象,沙地种类多样,分布广泛.Desertification of various degrees have been happening source region of Yangtze R...