次级的英文：
secondary
sublevel
ungraded

Secondary pattrn
次级方向图

These are second-grade grapes.
这些是次级葡萄。

secondary electron emission
次级电子发射

A secondary woody stem or limb growing from the trunk or main stem of a tree or shrub or from another secondary limb.
分枝从树或灌木的主干或另一次级树枝上生长出来的次级树枝

The subauthority part of a security ID is invalid for this particular use.
对于该特别用法，安全ID的次级授权部分无效。

The greatest uncertainty about the physics of windraised dust centres around the raising of secondary particles.
关于风吹起尘埃的物理学的最大不准确性在于次级粒子的抬升。

The spray coils are frequently used to chill the secondary water circuit to the induction units in winter.
冬季人们常用喷水盘管冷却诱导器中的次级水流。

Three hours after it occurred, Lushan vortex causes the formation of Huang-gang vortex by its secondary circulation.
庐山低涡在发展强盛时,通过次级环流诱发了黄石附近中β涡的形成。

This property absorbs the first3 points of sonic damage per attack that the wearer would normally take.
次级抗音：拥有此属性的魔法物品可以帮穿戴者抵消每次攻击的前3点音波伤害。

A secondary involucre,as at the base of an umbel within a compound umbel.
次总苞，小总苞次级花被，如处于复合伞形花序中一个伞形花序基部之花被

To contain as a secondary or subordinate element.
含有作为次要的、附属的成分而包含

lodging for occasional or secondary use.
偶尔用到的临时寓所。

secondary recycle isobutane
再循环异丁烷

Establishment of the Ventilation System of Sublevel Caving in Polylevel Mining
多中段开采分段崩落法通风系统的建立