简单问题：vector<string> and vector3f分别表示什么意思？

分别举例如下：vector<string> lines;    //是不是强制类型转换？ vector3f up,right,out;    //这个vector3f?
matrix16f face;
face.LoadIdentity();

unsigned i = 0; for (i = 0; i < part->child.size(); i++) {
vector3f offset = part->child[i]->offset;
switch (display) {

case LINES:
if (part->child[i]->child.size() == 0) glColor3f(0.9f,0.5f,0.0f);
else glColor3f(1.0f,0.1f,0.1f);
glPushMatrix();
glMultMatrixf(ident.matrix);

glBegin(GL_LINES);
glVertex3f( 0,0,0 );
glVertex3fv( offset.vertex);
glEnd();
glPopMatrix();
break;