5、The picture unveils that while boating in a lake and enjoying sightseeing, a couple of tourists are discarding their picnicking leftovers casually into the lake.

【译文】图片揭示出，在湖中泛舟观光浏览时，一些游人正在往湖中随意地乱扔他们的野餐垃圾。

【分析】本句用于图画作文的开头，用于总体描述图画内容，句中的that引导宾语从句。句中unveil还可以替换为 show/describe/unfold/reveal/disclose 等。和此句型类似的表达还有 From the picture we can see that... ； It can be seen from the picture that …；As is shown in the drawing that…等。

6、On the one hand, the lake is already teeming With various kinds of rubbish that are floating on the surface, such as plastic containers, banana skin, fish-bones and food wrappings. On the other hand, the caption is indicative of such a phenomenon that a large amount of garbage is thrown away along the trip.

【译文】一方面，湖中布满了各种各样的垃圾，漂浮在表面，有塑料容器、香蕉皮、鱼骨头以及食品包装袋等。另一方面，文字说明提示着这样一种现象，即旅游之后，垃圾遍地。

【分析】本句用于图画作文的开头部分，在总体描述图画内容后，从两个方面对其进行具体介绍。On the one hand…On the other hand…常用于介绍事物的两个面，也可以用于列举对所述问题提出的建议或应采取的措施，或者说明引发某事物的原因。