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を
1. indicates direct object of action
2. indicates subject of causative expression
3. indicates an area traversed
4. indicates time (period) over which action takes place
5. indicates point of departure or separation of action
6. indicates object of d...
表示动作的直接对象；表示经过的场所；表示离开或分开的点
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養う， やしなう
1. to support, to maintain, to provide for
2. to bring up, to raise, to rear, to feed
3. to adopt (a child)
4. to cultivate (a habit, a quality, etc.), to develop, to build up, to foster
5. to recuperate (from injury, illness, etc.)
支持，维持，供养；抚养，养育，照料，喂养；培养(习惯、品质等)，发展，建立，促进；康复(从伤病等中恢复)
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なければならない， なければなりません， なければいけない
1. have to do, must, should, ought to
必须，应该