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地盤， じばん， ちばん
1. ground, crust (earth), bed (gravel, river, etc.)
2. foundation (building, etc.), base
3. constituency, power base, support (electoral), footing, foothold
地表、地壳(地球)、地层(砾石层、河流沉积层等)；基础(建筑物等)；底座；地盘；选区、立足点、立足之地
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緩む， 弛む， ゆるむ
1. to become loose, to slacken (e.g. rope)
2. to become less tense, to relax, to let one's guard down
3. to slacken (e.g. coldness, supervision), to become lax
4. to become softer (e.g. ground, facial expression), (of ice) to partially melt
5. to dec...
变得松弛、松软；松弛下来(例如：绳子)；降低紧张情绪，放松下来，放下戒备心；使降低(例如速度)；变得柔软(例如地面、面部表情)；(冰)部分融化；放松（如寒冷、监督等），变得松懈