I like to use pencils with erasers on top.我喜欢用带橡皮的铅笔.There are some books, pens, erasers and so on in my bag.我的书包里有书 、 笔 、 橡皮等等.Here are new erasers in all colours and shapes.这些是五颜六色的各式各样的新橡皮....
Inside the melanocyte a number of mechanisms control the formation of pigment.在黑色素细胞中,还有一些因素影响着色素的形成.Objective : To isolate and culture hair outer root sheath amelanotic melanocyte derived from human scalp.目的从人头皮毛囊外根鞘分离纯...
The tidal stream or current gradually decreases in the shallows.浅滩上的潮水逐渐退去。a tidal wave of crime犯罪高峰期The river is tidal up to this bridge.这条河的潮水会涨到这座桥....