aspens

multi-touch is a rising area of touch interaction, which allows interactions deter-mined by simultaneous contact of multiple fingers ( or other pointing methods, such aspens) directly with graphical objects which are displayed on the screen.

多触点交互是一种新型的触摸交互方式，允许用户在显示表面上使用一个或多个手指（或其它指点方式，如光笔）同时通过触摸操作显示对象。

they crossed the river by a ferry, and rode long time in silence, while the twilight slowly fell behind the aspens. it is desirable that compensating cables be run in earthed conduit.

他们乘一只摆渡船过了河，默不作声地骑了一大段路，那时候，暮色慢慢地落在白杨树的后面了。补偿导线最好在地下管道中穿过。

it is pointed out that aspens are the best raw material making high yield pulps, and that development of straw high yield pulps is an important way that eliminates the pollution of chemical straw pulps.

指出杨木是制高得率浆最好的原料，发展高得率草浆，是解决化学草浆污染危害的重要途径。