墙壁: wall...
牌子: sign, trademark, brand...
乐意: to be willing to do sth, to be ready to do sth, to be happy to do sth, content, satisfied...
身体: the body, one's health, in person...
要是: (coll.) if...
碰见: to run into, to meet (unexpectedly), to bump into...
下课: to finish class, to get out of class, (esp. of a sports coach) to be dismissed, to be fired...
