出现

She had an ulcer in her mouth.

她口腔溃疡。

Trouble has blown up at the school.

学校里开始麻烦。

A crescent moon peeped out from behind the clouds.

一弯新月云中。

A difficulty has cropped up at work.

工作中突然困难。

The sun was peering through the clouds.

云中隐约。

So not only super-harmonic,also subhar monic and stochastical oscillation will appear.

因而，系统不但高次谐波，而且还将亚谐波及随机振象。

A job fell vacant in the accounting department.

财会部了一个空缺。

A note of discord crept into their relationship.

他的关系了裂痕。

Misprints often crop up in the papers.

报上常印刷错误。

The ship took on a dangerous cant to port.

船只向左舷危险倾斜。

Earthquake pitted the surface of the earth.

地震使地面了凹陷。

Instability may arise at times of change.

变革时期可能会乱。

A fungus of ugly little houses sprang up.

突然一排难看的小屋。

A dark cloud loomed up over the horizon.

一片乌云突然在天际。

I was completely nonplussed by his sudden appearance.

他突然使我大吃一惊。

The moon peeped out from behind the clouds.

月亮云层中隐约。

A warder appeared at the cell door.

一个看守在牢门口。

Abdominal tissues sometimes adhere after an operation.

手术之后腹部有时会粘连。

Victory was dawning on the battle front.

战场上了胜利的曙光。

The advent of the Euro will redefine Europe.

欧元的将重新定义欧洲。