Draw your child's outline with a heavy black marker.用浓黑色的毡笔画出你孩子的轮廓。He placed a marker where the ball had landed.他在球落地的地方放了个标记。Step off twenty feet and then place a marker in the ground.先步测20英尺,再在地上做出标记....
Draw your child's outline with a heavy black marker.用浓黑色的毡笔画出你孩子的轮廓。IntI 1 integrase gene and class 1 integron marker genes were detected by PCR.PCR扩增检测intI1整合酶基因,sul1和qacE△1基因.A hardpoint marker should be placed at...