His mother scanned his face to see if he was telling the truth.

他母亲仔细观察他查明他是否说真话。

The involved mucose was mainly on the cheek, tongue, lip and gingiva.

虽发生率高，但只要仔细观察、有效护理，是可以降低口腔粘膜发生程度。

He examined the man with a penetrating gaze.

他以锐利目光仔细观察了那个人。

Her face remained impassive,studying the Belgian as he completed the form.

她不动声色,仔细观察正在填写那个比利时人。