a rule of thumb例句
As
a rule of thumb, a cup of filter coffee contains about 80mg of caffeine.
凭经验估计，一杯过滤咖啡约含80毫克咖啡因。
As
a rule of thumb , the minimum device feature is about 4 times the beam diameter.
一般来说, 最小器件图形大约是电子束直径的4倍.
A rule of thumb is to allow flexibility with length.
一条经验法则是允许灵活性和长度.