Almost by reflex, he helped himself to a drink.是什么意思？

Almost by reflex, he helped himself to a drink.

几乎是下意识的, 他给自己弄了杯酒.

almost

adv. 几乎，差不多，将近，快要，近乎；

例句
Despite considerable pain she has been getting out and about almost as normal...
尽管还很痛，她已经基本上行动如常。

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

reflex

n. 反应能力，反射作用，复印，复制，影像，映像；adj. 反射的，反射性的，反作用的，反省的，回想的，本能的；vt. 反折，反曲，反射；

例句
I had the conviction Larkin's nerve would crack and he'd squeeze the trigger in a reflex action...
我确信拉金会神经崩溃，他会反射性地扣动扳机。

he

pron. 他，它，一个人；n. 雄性动物；

例句
Logic had prevailed and he had abandoned the idea.
最终理智占了上风，他打消了那个念头。

helped

v. 帮助( help的过去式和过去分词 )，有助于，有利于，治疗，避免；

例句
The scriptwriter helped him to adapt his novel for the screen...
编剧帮助他将其所著小说改编成电影。

himself

pron. （反身代词）他自己，（用以加强语气）他亲自，他本人；

例句
He pleaded guilty before a court martial to absenting himself without leave.
在军事法庭上他对自己擅离职守表示服罪。

to

prep. 向，朝着，到，关于，属于；adv. 朝一个方向的，到某种状态，关闭；

例句
I suggest you leave it to an expert...
我建议你把它留给专家来解决。

drink

vt.& vi. 喝（酒），饮，喝酒，（尤指）酗酒；vt. 吸收，吸入；n. 酒，饮料，酒宴，一杯或一份酒；

例句
Do you drink alcohol, smoke, or abstain?
你喝酒抽烟吗，还是烟酒不沾？