1. Together, these particles form that most diffuse and insubstantial of substances -- interstellar dust. 聚集在一起，这些微粒形成了大多数弥漫、脆弱的物质——星际尘埃。
2. Obama brushes aside the notion that his rhetoric is insubstantial. He says he would inspire people to come together to solve problems. 奥巴马全然不理会那些说他措辞毫无实质的言论。他说他会鼓舞人民团结起来解决问题。
3. Obama brushes aside the notion that his rhetoric is insubstantial. He says he would inspire people to come together to solve problems. 奥巴马并不理会那些认为他言辞浮华的见解，他表示他将激励人们团结起来解决问题。
英英解释
adj.
1. lacking material form or substance; unreal
2. lacking in nutritive value
