Positive incidence

positive ['pɑzətɪv]

adj. 积极的;确实的，肯定的;[数]正的;[医]阳性的; n. 正面;正片;[语]原级形容词;[数]正量;

posit肯定+ive形容词后缀 → 肯定的；积极的

incidence ['ɪnsɪdəns]

n. 发生率;影响范围;[数]关联，接合;[物]入射，入射角;

in 加“使…”、“作…” + cid + ence 表示性质、状态、行为、义同-en → n.发生率，发病率

What's troubling you?

你有什么麻烦？

But she is now accustomed to it.

不过她现在已经适应了。

The only way that they can preserve their history is to recount it as sagas -- legends handed down from one generation of another.These legends are useful because they can tell us something about migrations of people who lived long ago, but none could wri

他们保存历史的唯一办法是将历史当作传说讲述，由讲述人一代接一代地将史实描述为传奇故事口传下来。