stop sb. from doing sth=prevent sb.from doing sth=keep sb.from doing sth.意为:阻止某人做某事,其中前两个短语中的from可略,意思不变,而最后一个短语中的from不可略,略去后意为:坚持做某事.
protect sb.from doing sth.意为保护某人免受.的伤害,且from不可略.例：We should protect our skin from being burnt in summer.