The longer the tiny specks of ice bounce around in the wind , the bigger they become . When the clumps of ice grow too big for the wind to hold up , they fall to the ground as hail .
当气流再也无法支撑住冰团时,冰团便落向地面,成为我们所看到的冰雹。
Since the apollo missions brought back the first clumps of lunar soil and rock in the 1960s , scientists have worked on the assumption that the moon is bone dry .
This shortage can cause weak , deformed fingernails and toenails and hair that falls out in clumps .
维生素缺乏会导致手指甲、脚趾甲薄弱畸形,头发大量脱落。
When the disk begins to coalesce into protoplanets , the gravity of those protoplanets pulls clumps of gas around the disk with them as they orbit the star .
The picture is dominated by the enormous structure of gas that threads the space between the stars with skeins and clumps of glowing hydrogen .
星系之间线状和簇状发光氢气在宇宙中纵横交错的巨大结构占据了图片的主要部分。
This new wise picture , released april 8 , shows that the dusty cloud is a star-forming region that includes examples of early stages of stellar evolution , such as baby stars wrapped up in their natal blankets of dust and clusters of massive stars emerging from cold clumps of gas .
While the most advanced drugs have focused on removing clumps of beta amyloid protein that forms plaques in the brain , researchers are also now looking at therapies to address the toxic tangles caused by an abnormal build-up of the protein tau .
We 're climbing an enormous pile of gravel . There 's no vegetation to cling too . We use little clumps of grass , tiny seedlings , anything that won 't slip , as footholds .