Early pregnancy is often accompanied by nausea.是什么意思？

Early pregnancy is often accompanied by nausea.

怀孕期常有恶心的现象。

early

adj. 早的，早期的，早日的，（果实等）早熟的；adv. 早，在初期，先前，提早；

例句
Popular acceptance of authority had been an early aim of the Nationalists.
国家主义者的一个早期目标是推动民众对权威的接受。

pregnancy

n. 怀孕，妊娠，丰富，多产，意义深长；

例句
Again the pregnancy was very similar to my previous two...
同样，这次怀孕和我前两次的情形非常相似。

is

vt.& vi. 是（be的三单形式；n. 存在；

例句
Bollinger 'RD' is a rare, highly prized wine.
博林格RD香槟是一种名贵的备受推崇的葡萄酒。

often

adv. 常常，经常，时常，再三；

例句
Genetic abnormalities are more often associated with faults in paternal DNA than in maternal DNA.
相对于母本DNA,基因畸变往往更多地与父本DNA上的缺陷相关。

accompanied

v. 陪伴( accompany的过去式和过去分词 )，陪同，伴随…同时发生，伴奏；

例句
She was accompanied by her younger brother...
她由弟弟陪着。

by

prep. 在…旁边，表示方式，由于，经过；adv. 经过，表示保留或保存时用，短暂拜访；

例句
...expensive make-up that we saw being advertised by a beautiful model...
我们所见的由一位漂亮模特代言的昂贵化妆品

nausea

n. 作呕，恶心，反胃，极度厌恶；

例句
You feel nausea and aches in your muscles...
症状为恶心和肌肉疼痛。