Many insects can perceive colours of the spectrum that are invisible to us.许多昆虫能感觉到光谱中我们所看不见的颜色。Parents fear they might overstep these invisible boundaries.父母担心他们可能会逾越这些无形的界限。The mends were almost invisible.补好的地方几乎看不出来.A...
It was strange, how invisible a clerk could feel.一名办事员会感到如此受人忽视，令人觉得不可思议。The invisible trade surplus was £200 million lower than reported.无形贸易盈余比报道所称的少2亿英镑。The container is invisible until you shine an ultraviolet light ...