VOA慢速英语:Roman Toilets Offered No Clear Health Benefits

短语讲解：

1. In fact, parasites like whipworm, roundworm,  and Entamoeba histolytica dysentery slowly increased, compared to the Iron Age before the Romans ruled Europe.

in fact 事实上; 实际上
例句：They were, in fact, probably used while debugging the software.
它们事实上很可能是在调试程序时使用的。
compare to 把…比作， 喻为; 与…相比
例句：Compare to his early work, this is a rather slight novel.
这部小说与他早期作品相比, 不甚重要。

2. The waters were not changed often, and scum, or a layer of human dirt and cosmetics, would float on the top of the bathing water.

on the top of 在...之上
例句：Bonfires were kindle on the top of the hills.
山顶上燃着一堆堆篝火

3. Now, in modern times, we know the waste must not be used for many months before adding it to fields.

be used for 用来做…
例句：It can be used for devising systems to protect against frost damage.
它可用来设计防止霜害的方法。

4. It was traded across the empire, so it may have transported the fish tapeworm along with the sauce, Mitchell said.

along with 连同; 以及; 和…一起
例句：The bill came along with the package.
单据和包裹一起来的。