The trouble and the waste caused by abandoning the core of the ball pen and changing a new one without using up the ink are avoided.
避免了圆珠笔总是笔油用不完就要将笔芯弃旧换新，而带来了麻烦和浪费。
2
The pen and the ink have both given the writer trouble.
钢笔和墨水都给这人添了麻烦。
3
It also introduces a new resist ink for sign manufacture, its operating procedure and trouble-shooting. Some proposals for environment protection are provided.