tear test : (1) test which determines grain direction of paper .
纸张顺着纸纹较逆着纸纹容易撕开。
do heavy work is not to wear diamond diamond watch, although wear, but if according to the grain direction is likely to damage a blow.
做粗重工作时是不宜配戴鉆石腕表,鉆石虽耐磨,但若依其纹路方向受到重击仍有可能破损。 。
the grain direction must go from head to tail.
纸张的纹理必须垂直地从头顺到尾。
the grain direction of the compound plywood is the same with the width direction of the finished board, so the short and small material can be used as the raw material for processing the single board.