Commentary:
This is an example of an on-ball defensive foul for blocking. An on-ball, block/charge situation occurs when contact is made between a defensive player and an offensive player who is moving in a particular direction or trying to change directions. The defender is permitted to establish his legal guarding position in the path of a dribbler, thus "beating him to the spot." To get into a legal position, the defender needs to establish himself in the path of the offensive player before contact is made, and before he starts his upward shooting motion. On this play, the defensive player makes illegal contact while attempting to position himself in the dribbler's path.

防守方阻挡犯规之二：守方球员未能预先抢占攻防运球球员，而从侧面与对方发生碰撞；
Blocking, on-ball defender on baseline drive does not establish position

Commentary:
This is an example of an on-ball defensive foul for blocking. An on-ball, block/charge situation occurs when contact is made between a defensive player and an offensive player, who is moving in a particular direction or trying to change directions. A defender is permitted to establish his legal guarding position in the path of a dribbler, thus "beating him to the spot." To get into a legal position, the defender needs to establish himself in the path of the offensive player before contact is made and before he starts his upward shooting motion. On this play, the defender does not beat the offensive player to the spot, and the contact is made from the side.

防守方阻挡犯规之三：在试图破解攻防挡拆战术时，防守方球员违规碰撞攻防运球球员
Blocking, defender hedges out on Pick'n Roll, does not establish legal position

Commentary:
This is an example of a defensive foul for illegal contact on the perimeter. An on-ball, block/charge situation occurs when contact is made between a defensive player and an offensive player who is moving in a particular direction or trying to change directions. A defender is permitted to establish his legal guarding position in the path of a dribbler, thus "beating him to the spot." To get into a legal position, the defender needs to establish himself in the path of the offensive player before contact is made. On this play, the defender does not establish a legal position in the path of the dribbler and he makes illegal contact with the dribbler.