lead block的用法和样例：
例句
- Some distance above the lead block a photographic plate is placed.
在铅块上方某一距离处放一照相底板。
lead block的相关资料：
临近单词
Leadtek
lead
Lead Computing Optical Sight
lead screw measuring machine
lead foam negative electrode
Lead Inventory Control Point
Lead Standardization Activity
lead weighted urethral bougie
Lead chrome yellow wastewater
lead a charmed existence life
Lead - Calcium master alloy
leadless ceramic chip carrier
