When the stress reaches the yieldpoint, a large increase in strain occurs with no increase in stress.
当应力达到屈服点，应变会急剧增大而应力保持不变。
2
The yieldpoint is the stress at which there is an appreciable increase in strain with no increase in stress, with the limitation that, if straining is continued, the stress will again increase.
屈服点是在应变有可观增加，应力没有增加的应力极限，在这个极限下，如果应变继续增加，应力就也会增加。
3
Beyond the yieldpoint, the material will continue to deform, but with less stress than before, because the material has begun to yield.