如果没有他们，那就将发生极大的困难。
虽然矿井安全已极大改善，矿工的家属们仍然担心发生最糟糕的事情。
Though mine safety has much improved, miners' families still fear the worst.
人们的需求发生了极大变化。
随着因特网的推广，人们的学习方式发生了极大的改变。
With the popularization of Internet, the way of learning has changed greatly.
校貌一年间发生了极大地变化。
The environment of our school has undergone dramatic changes in a year.
当氟与铝共存时，石膏晶体的外形发生了极大的变化，几乎都形成了球状聚晶；
The shape of gypsum crystal changes little in the presence of Al 3+ ion.
当氟与铝共存时，石膏晶体的外形发生了极大的变化，几乎都形成了球状聚晶；
The shape of gypsum crystal changes little in the presence of Al 3+ ion.
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