4. teacher clay oil fillings straight drill straight and hands squeeze bottle bottles air bottles. Until the smoke out of the bottle passes until paid.
4. The teacher brought the oil to penetrate the stopper at the bottom of the bottle. Hand and squeeze the air out of the bottle after bottle. The smoke from the bottle through the toilet paper ran out.
4. Teachers bring plasticine to plug the drill at the bottom of the bottle. Hand priming and squeeze bottle out of the bottle mouth. Till the smoke out of the bottle through the toilet paper until the end.