|   New    Known    Review | 
| burgeon | 
|     | 
| v. Syn. thrive; mushroom (發芽,成長) grow forth; send out buds; grow or develop rapidly | 
|   New    Known    Review | 
| burial | 
|     | 
| n. Syn. grave (埋葬,葬禮) grave or tomb; ritual placing of a corpse in a grave; concealing something under the ground | 
|   New    Known    Review | 
| burrow | 
|     | 
| n. Syn. tunnel; den (洞穴,供居住或躲藏的洞或地道) tunnel; hole in the ground made by an animal for shelter; dig; move through by or as by digging | 
|   New    Known    Review | 
| bustle | 
|     | 
| v. Syn. teem (喧囂,繁忙,熙熙攘攘) move or cause to move energetically and busily; teem |