介绍： 词根spect = see
1.audience ['ɔːdɪəns]
n. 听众，观众，读者（受众）

2.spectator [spek'teɪtə]
n. （尤指体育赛事的）观众

3.doubtful ['daʊtf(ə)l]
adj. 不确定的；感到怀疑的
It was doubtful whether the patient would survive the operation.
病人能否挺过这次手术还无法确定。

4.dubious ['djuːbɪəs]
adj. 可疑的，无把握...

介绍： 词根spect = see
1.audience ['ɔːdɪəns]
n. 听众，观众，读者（受众）

2.spectator [spek'teɪtə]
n. （尤指体育赛事的）观众

3.doubtful ['daʊtf(ə)l]
adj. 不确定的；感到怀疑的
It was doubtful whether the patient would survive the operation.
病人能否挺过这次手术还无法确定。

4.dubious ['djuːbɪəs]
adj. 可疑的，无把握的
I’m dubious about his promises to change his ways.
我对他改变他的生活方式的承诺表示怀疑。

5.skeptical ['skeptɪkəl]
adj. 怀疑的
Many experts remain skeptical of/about his claims.
许多专家对他的主张仍持怀疑态度。

6.sight [saɪt]
n. 视力，景象 vision，view
The old woman has lost her sight.
那位老妇人失明了。
The flowers at the annual flower show were a beautiful sight.
年度花卉展上的鲜花是一道美丽的景象。

7.sightsee ['saɪtsi:]
v. 观光
go sightseeing 去观光
sightseer 观光客

8.insight ['ɪnsaɪt]
n. 洞察力
It was an interesting book, full of fascinating insights into human relationships.
这是一本有趣的书，充满了对人类关系的独到见解。
insightful adj. 有深刻见解的，富有洞察力的

9.echo ['ekəʊ]
n. 回声
vi. 发出回声，作出回应
echo location 回声定位（海豚，蝙蝠等动物）

10.vocal ['vəʊk(ə)l]
adj. 有声的
vocal music 声乐
vocal cord 声带