Noun:

1. the condition of being folded inward or sheathed

2. the folding in of an outer layer so as to form a pocket in the surface;

   "the invagination of the blastula"
   

3. (psychology) an introverted disposition; concern with one's own thoughts and feelings

introspectionn.内省；反省；自省

self-absorptionn.聚精会神；热衷；专心致致

inwardnessn.内质；本性；实质；亲密；熟悉

contemplationn.注视；沉思；打算

shynessn.羞怯；胆怯

navel-gazingn.静思；沾沾自喜般的自我专注

timidityn.胆小；胆怯；羞怯

reservevt.保留；预订；延期n.候补；预备品；贮存n.含蓄；克制

musingn.沉思；冥想adj.沉思的；冥想的动词muse的现在分词形式.

soul-searchingn.真挚的自我反省；深思

invaginationn.入鞘；反折处；凹入部分；[医]肠套叠

infolding内折

intussusceptionn.[医]肠套叠；[生]摄取

ambiversionn.两向性格

extraversionn.[心理]外向性；[医]外翻=extroversion.

extroversionn.[医]外翻；[心理]外向性=extraversion.

1. However, introversion certainly has its advantages.
   然后,内向性也是有它的优势的
2. It begins with the distinction between introversion and extroversion.
   从内向性和外向性的区别开始。