Chemical fertilizer is hurtless. The problem of the fertilization comes from unreasonable use.
化肥本身是无害的，有害的是对化肥的不合理施用。
Dynamic electrocardiogram (Holter) had been applied in clinic extensively with the properties of simple, convenient and hurtless after its appearance.
动态心电图自投入使用以来，就以其简单、方便、无创的特点在临床中得到广泛的应用。
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