lettering triangle是什么意思

用法例句

A child wrote a line under spontaneous and dual-task conditions, a digitizing tablet was used to record the handwriting movements′ velocity and acceleration.

选取小学生47名,其中23名为数学不良,24名为一般儿童,使用数码写字板,测试二者在自然和双任务条件下,书写一条横线的速度、加速度。