The skeleton consists of differently shaped bones held together by ligaments.人体骨架是由依靠韧带连接的形状相异的骨头构成。He suffered torn ligaments in his knee.他膝关节韧带拉伤了。He must have a major operation on his knee to mend severed ligaments.为了...
皮层的内层分化为内皮层.The inner layer of the cortex differentiates into the endodermis.初生根为四原型, 内皮层明显,可见到凯氏带.The primary root is tetrarch , and endodermis with casparian strip is obvious.内皮层未见凯氏带.The Casparian strip is not clear i...