heavy习惯上不与具体的重量连用
■像old, long, tall, deep, thick, wide等形容词可用于具体的年龄(历史时间)、长度、高度、深度、厚度、宽度等。如：
He is forty years old. 他四十岁了。
She is only five feet tall. 她只有五英尺高。
The room is ten metres long. 这间屋子长10米。
The fiver is 100 metres wide. 这条河有100米宽。
The water was fifteen feet deep. 水有十五英尺深。
The layer of rock was ten metres thick. 那层岩石有十米厚。
Lake Nyasa is 450 miles long by about 50 miles wide. 丽莎湖450英里长，约50英里宽。
It is estimated that the vase is 2000 years old. 据估计这个花瓶有两千年历史。
That vase is valuable. It’s more than 200 years old. 那个花瓶很宝贵，它有二百多年的历史。
■但heavy不一样，它不能与具体的表示重量的短语连用。如：
每个箱子重约10公斤。
误：Each box is about 10 kilos heavy.
正：Each box is about 10 kilos.
这件行李重20公斤。
误：This luggage is 20 kilograms heavy.
误：This luggage is 20 kilograms.