界的的英文：
natural

参考例句：

The sporting world
体育界,运动界

Ireland borders the Atlantic Ocean
爱尔兰以大西洋为界。

Li shizhen was the originator of the Chinese pharmacology.
李时珍是我国医药界的鼻祖。

The playing area is demarcated by a white line.
运动场地以白线为界.

He has come rather to the front lately in the French detective service.
他最近在法国侦探界里崭露头角。

Religious cults and priesthoods are sectarian by nature
宗教崇拜和僧侣界天然就有派性。

The posterior borders of the left ventricle and inferior vena cava are well seen
左心室和下腔静脉的后界看得很清楚。

Mrecator might be used by a geologist mapping current directions in palaeozoic sediments
地质学家可用麦卡托投影来绘制古生界沉积的水流方向。

officialdom.
官场，公务员界

fields bordered by woods
以树林为界的田野

natural是什么意思：
adj. 自然的；天然的；不做作的；天生的；原始的；有血缘关系的
n. 天然物；生就具有特定才能的人

natural | natural sign
白键|本位记号

The method is a natural.
这方法一定灵。

Is there necessity in nature?
自然界是否存在必然性？

It is in the nature of lightningrods.
它具有避雷针的性质。

natural language
自然语言(指人类语言集团的本族语,与世界语或计算机语言等人造语言相对)