n.

1. 觀察；觀測；觀察力[U][C]
   He is a man of little observation.

   他是個觀察力極差的人。

2. （觀察後發表的）言論，意見[C][（+on/about）][+（that）]
   I have a few observations to make on your conduct.

   我對你的行為有一些看法要說。

3. 察覺；注意，監視[U]
   They decided to put him under observation.

   他們決定監視他。

4. 觀察（或觀測）資料（或報告）[P1]
   He will publish his observations on the social life of these primitive tribes.

   他將公布他對那些原始部落的社會生活觀察所得的資料。

n.

1. the action or process of closely observing or monitoring.
2. the ability to notice significant details.
3. the taking of the sun's or another celestial body's altitude to find a latitude or longitude.
4. a comment based on something one has seen, heard, or noticed.