难以置信: hard to believe, incredible...
气泡: bubble, blister (in metal), (of beverages) sparkling, carbonated...
后背: the back (human anatomy), the back part of sth...
只不过: only, merely, nothing but, no more than, it's just that......
直径: diameter...
黄瓜: cucumber...
报复: to make reprisals, to retaliate, revenge, retaliation...
致使: to cause, to result in...
胆小: cowardice, timid...
烹饪: cooking, culinary arts...
