植物的肺就是其叶片上微细的气孔。A plant's lungs are the microscopic pores in its leaves.在干旱的条件下, 叶子的膨压减少而气孔关闭.Under conditions of water stress, leaf turgor decreases and stomata close.他使橡胶塞牢固地塞进盖上的排气孔.He presses the rubber stopper ...
Embroidery calls for great care . There must not be even a single sloppy stitch.刺绣要求很高, 一针也不能马虎.It is a headache to decipher his sloppy penmanship.辨认他的潦草的字迹叫人头痛.Mother constantly picked at him for being sloppy.母亲不断地批评他衣着...