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- Demand is slack over the summer months. 夏季的几个月市场滞销。
- Slack up before you reach the crossroads. 驶近十字路口时要减低速度。
- Harden up a little, we need more speed. 把帆索拉紧一点，我们需要加快速度。
- Slack off/up as youapproach the junction. 接近交叉口时要减速。
- Don't slack off in your studies. 不要荒费你的学业。
- Winter is the slack season at most hotels. 冬天是大多数旅馆的淡季。
- Hot steel is quenched to harden it. 烧热的钢淬火使它坚硬。
- The varnish takes a few minutes to harden. 清漆几分钟就能变硬。
- slack hardening 不完全淬火
- Not taut, firm, or compact; slack. 松弛的不紧、不严密或不坚实的; 放松的
- Don't harden your heart against him. 别对他硬心肠。
- After intense work in the summer, we are slack off now. 夏季紧张的工作过後，我们现在放松了。
- So we find that hardening operation is made up of heating and quenching. 因此我们发现淬火工序包括加热和淬硬两个步骤。
- The sailors pulled at the rope to take up the slack. 水手们拉起绳索把它收紧。
- Please harden in the main ropes, the sail's not tight enough! 请把主要的绳索拉紧些，帆扯得不够紧！
- Anneal means make harden steel soft and remove brittleness. 退火就是使淬火钢变软并消除其脆性。
- The tractor took up the slack and pulled the trailer out of the mud. 拖拉机拉紧拖缆把拖车从泥中拉了出来。
- Able to set and harden under water, as Portland cement. 在水中变硬的能在水下定型并变硬的，如波特兰水泥
- January is always a slack period. 一月份总是萧条时期。
- He often went to the gym to harden his muscles. 他过去常到健身房锻炼肌肉。
